Potato common scab is caused by Streptomyces species, filamentous soil bacteria that produce corky, unsightly lesions on tuber surfaces. Although the disease rarely kills plants, the damage to potato skin can render crops unmarketable and cause substantial economic losses worldwide. Traditional controls, including soil amendments, crop rotation, and chemical treatments, offer only partial relief, in part because the pathogens persist in soils for years. This has driven growing interest in disease-suppressive soils, natural or managed systems where the resident microbial community itself keeps pathogens in check. Understanding how to deliberately assemble such protective communities has been a central goal of soil microbiome research.

The research team attacked the problem with an unusually comprehensive toolkit, integrating three complementary approaches: metagenomics to catalog microbial genes and species, metabolomics to profile the small molecules circulating in the soil, and transcriptomics to track gene expression in individual bacterial strains. This combination allowed them to observe, at several levels simultaneously, what happens when silica nanoparticles enter a soil system under pathogen pressure. The datasets converged on a coherent mechanism, an unusual outcome in multi-omics studies where findings can be difficult to reconcile.

First, the team demonstrated that adding silica nanoparticles inhibited potato common scab in a dose-dependent manner, meaning that increasing amounts of the particles produced progressively greater disease suppression. Alongside this protective effect, the particles drove significant shifts in the structure of the soil microbial community and increased the complexity of the ecological networks connecting its members. Complex, densely connected microbial networks are often interpreted as a signature of a mature, stable, and functionally robust community, the kind of community thought to resist pathogen invasion. In other words, the nanoparticles were not acting as a sterilizing agent but appeared to be building a stronger microbial social fabric.

As the researchers sifted through the shifting community data, one bacterial group stood out. Bacillus emerged as the core nanoparticle-responsive taxon, its abundance and activity rising in concert with the silica treatment. Bacillus species are among agriculture’s most celebrated biocontrol agents, capable of producing antibiotics, degrading pathogen signals, and physically defending plant surfaces. The team isolated a representative strain, Bacillus velezensis PH3-11, and showed in laboratory tests that it antagonized pathogenic Streptomyces. Metabolic profiling of the antagonism pointed to isovaleric acid, a small branched-chain fatty acid, as a candidate antimicrobial compound associated with the strain’s pathogen-suppressing activity.

But how were the nanoparticles recruiting Bacillus and other protective microbes in the first place? The metabolomic and metagenomic analyses supplied a striking answer: the silica particles stimulated the accumulation of inosine, a purine nucleoside best known as a cellular metabolite involved in nucleic acid chemistry and energy transfer. Inosine levels in the treated soils correlated strongly with the community structure of the nanoparticle-responsive microbial markers, suggesting that this single molecule serves as a chemical beacon, a shared signal around which the protective community organizes. The idea that a specific soil metabolite can orchestrate microbial community assembly has become a major theme in plant microbiome science, and this study offers one of the most concrete demonstrations that engineered materials can hijack such signaling for agricultural benefit.

The mechanistic story deepened when the researchers examined how inosine acts on Bacillus velezensis PH3-11 at the level of gene expression. Transcriptomic analysis revealed that exposure to inosine upregulated a suite of genes involved in extracellular polysaccharide synthesis, including epsD, epsN, and epsO. These genes encode machinery for building the sugary matrix that bacteria secrete to form biofilms, the cohesive multicellular layers that anchor microbes to surfaces and shield them from stress and competition. Consistent with the gene expression data, inosine markedly promoted biofilm formation by the strain. In practical terms, inosine appears to help the beneficial bacterium settle in, build a home, and stay in the soil long enough to fight the pathogen.

To test whether this mechanism holds up under realistic conditions, the team ran field trials combining inosine with the PH3-11 strain. The results confirmed a synergistic effect: co-applying the metabolite and the bacterium outperformed inoculation with the strain alone on every measure that mattered. The combined treatment promoted better colonization by the biocontrol bacterium, suppressed disease more effectively, and enhanced the stability of the soil microbiome. This finding matters because one of the chronic failures of biological control is that introduced beneficial bacteria often fail to persist in competitive field soils. By supplying the metabolic cue that triggers biofilm formation, inosine seems to give the inoculant a critical settlement advantage, addressing a well-known bottleneck in the deployment of microbial agricultural products.

The implications extend well beyond potato fields. Silica is one of the most abundant and environmentally benign elements in the Earth’s crust, and silica nanoparticles are already under investigation for a range of agricultural uses, from controlled-release fertilizers to stress-protective coatings. If the mechanism documented here proves general, farmers could potentially pair inexpensive, low-toxicity nanomaterials with specific metabolites and beneficial microbes to build disease-suppressive soils deliberately, rather than waiting years for suppressiveness to develop naturally. The study’s authors frame this as manipulating the coupling between chemistry and biology in soil, a level of ecological control that has remained largely theoretical until now.

Cautious optimism is nonetheless warranted. The research, published open access in Microbiome on 30 August 2026 as a peer-reviewed accepted version, rests on a single pathosystem and a single biocontrol strain, and dose responses, long-term ecological effects, and regulatory questions surrounding engineered nanomaterials in food production will all require further scrutiny. Even so, the study delivers a compelling proof of concept: that a nano-metabolite-microbiome cascade can be specified, mechanistically dissected, and validated in the field. As pressure mounts to reduce chemical pesticides while feeding a growing population, engineering the chemical conversations that shape soil life may prove to be one of the most quietly revolutionary tools in sustainable agriculture.

Subject of Research: Silica nanoparticle-driven assembly of disease-suppressive soil microbiomes via inosine-mediated metabolic signaling and biofilm formation

Article Title: Silica nanoparticles drive disease-suppressive microbiome assembly via inosine-associated metabolic reprogramming and biofilm promotion

Article References: Lv, M., Shi, W., He, S., Li, Y., Li, M., Zhou, Y., Ma, L., Xu, J., Nie, F., Ning, T., Zhou, B., & Gao, Z. (2026). Silica nanoparticles drive disease-suppressive microbiome assembly via inosine-associated metabolic reprogramming and biofilm promotion. Microbiome. https://doi.org/10.1186/s40168-026-02491-w

Image Credits: AI Generated

DOI: 10.1186/s40168-026-02491-w

Keywords: silica nanoparticles, potato common scab, soil microbiome, disease-suppressive soils, inosine, Bacillus velezensis, biofilm, metabolomics, metagenomics, biocontrol, Streptomyces, nano-enabled synbiotics

The traditional route to identifying a sex pheromone has always been laborious. Researchers must typically maintain live colonies of the target insect, collect and extract the chemicals emitted by females, and then sift through a complex mixture of dozens or even hundreds of volatile compounds to determine which ones actually attract males. The timing of pheromone production matters enormously, since many species release their signals only during narrow windows of the day or night, and missing that window can mean missing the signal entirely. Once candidate compounds are isolated, each must be tested for behavioural activity, often through wind-tunnel experiments or field trials, before the true pheromone can be confirmed. For rare species, invasive pests that have just appeared in a new region, or insects that are difficult to rear in captivity, this process can stall for years, leaving pest managers without the species-specific tools that pheromone-based control depends on.

The INRAE team, working within the EXPLOR’AE Programme funded through the project known as Invoria, chose to invert this logic entirely. Rather than starting with the emitter of the chemical signal, they started with the receiver: the male moth, and more specifically, the olfactory receptors housed in his antennae that are tuned to detect the female’s scent. Their study species was the lily moth, Spodoptera picta, a strikingly coloured insect whose sexual communication had never been described. The lily moth is what biologists call a non-model organism: it is not a standard laboratory species with a rich history of prior research, and this was precisely the point. If the method could work on a poorly studied insect with no established toolkit, the researchers reasoned, it could likely be extended to many other species that currently resist conventional analysis.

The first step of the reverse approach relied on genomics. By analysing the genes of the lily moth and comparing them with those of related species, the researchers narrowed down a catalogue of candidate olfactory receptors to two promising candidates. This comparative step matters because receptor genes evolve alongside the chemicals they detect; receptors in closely related species that respond to similar pheromones often share detectable similarities in their sequences. From this genetic starting material, the team turned to artificial intelligence. Machine-learning tools were used to predict the three-dimensional structures of the two candidate receptors, generating models of the protein shapes that sit in the membranes of sensory neurons and cradle odorant molecules as they arrive from the air.

With structural models in hand, the researchers applied molecular docking, a computational technique widely used in drug discovery, to predict which volatile molecules would fit and bind within the receptors’ binding pockets. Docking simulations evaluate how two molecules can interact spatially and energetically, scoring the likelihood that a given compound will make stable contact with a target protein. By screening a library of volatile compounds against the modelled receptors, the computational pipeline identified a specific molecule predicted to interact strongly with both candidate receptors: (Z,E)-9,11-tetradecadienyl acetate. In effect, the algorithm had proposed an answer to a question the insects had never been asked in the laboratory: what chemical does the female of this species use to signal her availability?

Prediction alone, however, is never sufficient in biology, and the team followed the computational phase with a rigorous sequence of experimental validation. First, the selected olfactory receptors were tested directly against the predicted volatile molecules using electrophysiological methods, which measure the electrical responses of sensory cells or expressed receptor proteins when exposed to chemical stimuli. The receptors responded, confirming computationally predicted interactions with real physiological activity. Next, the researchers combined physicochemical analysis with electrophysiology to verify two crucial facts: that female lily moths actually secrete the predicted compound as their sex pheromone, and that male moths can detect the volatile molecule in the air. These analytical steps confirmed that the AI-guided prediction matched what the insects themselves were doing.

The final and most demanding test was behavioural. A molecule may be detected by an antenna, but detection does not guarantee attraction; only a behavioural response demonstrates that the compound functions as a genuine pheromone in the life of the animal. In behavioural assays, the identified compound attracted male lily moths and elicited sexual behaviour, completing the chain of evidence from gene to receptor to molecule to mating behaviour. Taken together, the results show that an unknown pheromone of a non-model species could be identified through a pipeline that begins with sequencing, passes through AI-predicted receptor structures and molecular docking, and ends with classical electrophysiology and behavioural experiments. Each stage filtered and focused the search, dramatically reducing the number of candidate chemicals that needed laboratory testing.

The significance of this proof of concept extends well beyond a single moth species. Current, emerging and invasive crop pests are precisely the organisms for which pheromone identification is most urgently needed and most often missing, because invasive populations can spread faster than conventional chemical ecology can characterise them. Once a species’ sex pheromone is known, two well-established biocontrol strategies become available. Mating disruption involves flooding an area, such as a crop field or orchard, with synthetic pheromone so that males become unable to locate females, crashing reproduction without any toxic chemical. Alternatively, pheromone-baited traps can be used to estimate population density, monitor invasions, or suppress populations through mass trapping. Both approaches are highly species-specific, sparing beneficial insects such as pollinators and natural enemies of pests, and both are compatible with the increasingly strict regulations governing pesticide use in gardens, parks and botanical collections.

The lily moth itself illustrates why such tools matter. The species is not found in mainland France and is therefore not considered a pest of concern there, which made it an ethically convenient and scientifically demanding test case. Yet elsewhere in the world, Spodoptera picta is a significant pest, particularly in private gardens, public parks and botanical gardens, settings where the use of conventional pest-control products is often tightly restricted and where ornamental plants suffer real damage. A validated pheromone-based method could give managers in those regions a targeted, low-toxicity option, and the study’s authors note that this work opens up the possibility of using pheromone-based methods to control the moth. In this sense, the research delivers both a general technique and a concrete practical outcome for a real agricultural problem.

There is also a deeper scientific payoff. Pheromones function as chemical signatures of species, and the molecules a species uses to communicate sexually contribute to reproductive isolation, helping to keep related species distinct. As a result, identifying the compounds that make up the pheromones of moths and other insects offers new insights into the evolutionary history of these lineages, revealing how chemical communication has diverged and shaped speciation. By making pheromone identification faster and less dependent on scarce live insects, the reverse chemical ecology approach demonstrated here could populate the field with many more of these chemical signatures, allowing biologists to reconstruct communication systems across entire groups of species. What began as a pest-management problem thus ends as a window onto evolution, powered by artificial intelligence, and a demonstration that sometimes the fastest way to understand a signal is to study the ear rather than the voice.

Subject of Research: AI-guided prediction of insect olfactory receptors to identify moth sex pheromones for crop protection

Article Title: Crop protection: a new method for understanding insect sexual communication

Article References: Crop protection: a new method for understanding insect sexual communication. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: pheromones, chemical ecology, olfactory receptors, Spodoptera picta, biocontrol, mating disruption, molecular docking, artificial intelligence, INRAE, BMC Biology, invasive pests, lily moth

The study, published in the open-access journal Stress Biology, focused on a commercially available fungicide formulation containing two beneficial fungal strains, Trichoderma asperellum ICC012 and Trichoderma gamsii ICC080. Trichoderma species are filamentous fungi famous among plant scientists for their mycoparasitic and antagonistic activities against a wide range of plant pathogens, and they are already registered and widely used as microbial fungicides. What has remained poorly understood, however, is precisely what happens at the level of gene expression inside host roots when these beneficial fungi are deployed ahead of a pathogen attack. The new research set out to close that gap by combining classical disease screening with high-throughput RNA sequencing and an advanced statistical framework known as Weighted Gene Co-expression Network Analysis, or WGCNA.

The phenotypic results were striking. In greenhouse trials using the Greek melon variety ‘Xrisi-kefali’, seedlings inoculated with FOM alone developed the full suite of Fusarium wilt symptoms, and by the end of the observation period the disease incidence had reached one hundred percent, with roughly 79 percent of leaves lost to defoliation. Seedlings pre-treated with the Trichoderma formulation before pathogen inoculation told a very different story. Disease incidence in this group was limited to about 40 percent, defoliation dropped to approximately 28 percent, and weekly disease index assessments over four consecutive weeks showed significantly lower severity compared with pathogen-only plants. Beyond disease suppression, the treated seedlings also grew better, showing greater shoot height, thicker stems, and more internodes, consistent with the well-documented growth-promoting activity of Trichoderma in the rhizosphere, which is thought to involve improved nutrient availability, mineral solubilization, iron chelation, and the modulation of hormonal signaling pathways.

To understand the molecular machinery behind this protection, the researchers sequenced the transcriptomes of melon roots collected at one, two, and three days after pathogen inoculation, comparing three treatments: plants treated with Trichoderma and then challenged with FOM, plants challenged with the pathogen alone, and untreated healthy controls. The sequencing effort generated approximately 944 million clean reads, averaging around 34 million per sample, with more than 88 percent mapping successfully to the melon reference genome. After stringent filtering, the team identified a non-redundant set of 9254 differentially expressed genes across all comparisons. Notably, the highest number of upregulated genes appeared in Trichoderma-pretreated, pathogen-challenged roots at the first and third days after inoculation, suggesting that the beneficial fungi trigger a time-dependent surge of defensive gene activity that pathogen infection alone does not produce.

The centerpiece of the study was the network analysis. Using WGCNA, the researchers grouped the 9254 genes into co-expression modules and eventually refined them into fourteen modules, four of which emerged as decisively correlated with the treatments. Two modules, dubbed midnightblue and cyan, were most strongly associated with pathogen infection alone at two and three days after inoculation, respectively. Two others, the blue and green modules, were tightly linked to the Trichoderma-pretreated plants at the first and third days. This separation proved conceptually important: the modules tied to pathogen infection alone reflected a stressed, pathogen-driven transcriptional state, while the modules tied to the combined treatment captured the active, Trichoderma-primed defense machinery that appears to establish resistance before substantial pathogen ingress.

Within the blue module, which represents the early Trichoderma-induced response, the researchers found a remarkable concentration of defense-related hub genes, the highly connected nodes that act as central regulators of the network. Four transcription factor families stood out: NAC domain-containing protein 2, the dehydration-responsive element-binding protein DREB1A, trihelix transcription factor GT-3b, and a heat stress transcription factor. These families are known orchestrators of plant immunity in other crops; a trihelix GT-3b gene has been linked to defense against Fusarium graminearum in maize, a pathogen-induced NAC factor modulates rust resistance in barley, and DREB1A overexpression enhances biotic stress tolerance in transgenic potato. Alongside these regulators, the module contained a gene encoding caffeoylshikimate esterase, or CSE, which participates in lignin biosynthesis, a branch of the phenylpropanoid pathway that plants use to reinforce cell walls and produce antimicrobial phytoalexins against fungal invaders. KEGG pathway enrichment confirmed the module’s defensive character, highlighting phenylpropanoid biosynthesis, the MAPK signaling cascade, and plant-pathogen interaction pathways.

The blue module also harbored genes encoding a chitin receptor kinase called LYK5, which works with CERK1 to detect fungal cell wall fragments and launch immune signaling, a phloem protein 2 involved in phloem-based defense, a nerolidol synthase-like gene producing volatile defense signals, and a subtilisin-like protease implicated in immune responses. The green module, correlated with the later Trichoderma-induced response, contributed its own arsenal: a two-component response regulator ARR14-like gene involved in hormone crosstalk, Kunitz trypsin inhibitor and miraculin-like proteins with documented antifungal activity, a MYB27 transcription factor, translation-related factors, and even an aquaporin that may influence defensive signaling. Together, these findings sketch a coherent picture of Trichoderma priming the melon root to mount a faster, stronger, and more coordinated defense than it could achieve on its own.

The dual nature of the protection became even clearer when the researchers examined the pathogen’s own transcripts within the same sequencing data. Across all three time points, FOM gene expression was consistently and dramatically suppressed in the presence of the Trichoderma formulation, often approaching near-zero levels. The repressed genes included multiple ribosomal proteins, pointing to a collapse in the pathogen’s protein synthesis capacity, as well as key metabolic enzymes such as ATP synthase, malate dehydrogenase, and cytochrome c peroxidase, indicating disruption of respiration and energy production. Most tellingly, the virulence arsenal itself was silenced: genes encoding xyloglucanases, pectate lyases, endoglucanases, and exoglucanases, the carbohydrate-degrading enzymes FOM needs to pierce plant cell walls, were markedly reduced, particularly at later time points. While the authors note that formal differential expression analysis would be needed to statistically confirm these patterns, the profiles strongly suggest that Trichoderma attacks the pathogen on two fronts simultaneously, starving it at a fundamental physiological level while arming the plant against it.

Several intriguing regulatory players emerged from the pathogen-associated modules as well. The midnightblue module’s hub genes were predominantly ribosomal RNA genes, upregulated after two days of FOM infection and inverted under Trichoderma pretreatment, hinting at a pathogen-driven reprogramming of the host’s translational machinery that the beneficial fungi can counteract. The cyan module contained upregulated long non-coding RNAs, increasingly recognized as key modulators of plant immunity through their effects on reactive oxygen species, calcium signaling, and transcription factor regulation, plus two uncharacterized genes homologous to retrotransposon proteins, suggesting that transposable elements may participate in the stress response. A pyridoxal kinase gene involved in vitamin B6 biosynthesis, an essential antioxidant in stress responses, was also highly expressed in this module.

The authors are careful to frame their findings within both the promise and the caveats of biological control. The experimental design mirrored real-world practice, applying Trichoderma preventively so it can establish in the rhizosphere before pathogen challenge, and the priming-based mechanism of induced resistance depends on that prior colonization. They also acknowledge that microbial biocontrol agents can reshape soil fungal communities, sometimes reducing fungal diversity or shifting competitive equilibria in ways that depend on soil type and inoculant persistence, a knowledge gap that matters for durable, biodiversity-conscious disease management. Still, the study delivers a molecular roadmap that could inform targeted breeding strategies and refined industrial formulations. By pinpointing specific hub genes and pathways, from CSE-driven lignin reinforcement to NAC and DREB transcriptional cascades, the work transforms Trichoderma biocontrol from an empirical black box into a mechanistically understood, engineerable system for protecting one of the world’s favorite fruits.

Subject of Research: Transcriptomic mechanisms of Trichoderma-mediated biological control of Fusarium wilt in melon roots

Article Title: Transcriptomic insights into the biocontrol mechanism of Trichoderma spp. against Fusarium wilt in melon

Article References: Aci, M. M., Tsalgatidou, P. C., Krommydas, K., Boutsika, A., Delis, C., Pavli, O. I., Schena, L., & Zambounis, A. (2026). Transcriptomic insights into the biocontrol mechanism of Trichoderma spp. against Fusarium wilt in melon. Stress Biology, 6(1), Article 44. https://doi.org/10.1007/s44154-026-00315-3

Image Credits: AI Generated

DOI: 10.1007/s44154-026-00315-3

Keywords: Trichoderma, Fusarium wilt, melon, biocontrol, transcriptomics, RNA-seq, WGCNA, plant immunity, hub genes, phenylpropanoid biosynthesis, MAPK signaling, sustainable agriculture

The significance of the findings begins with the crop itself. Mung bean, originally domesticated in India, is now cultivated on roughly 7.3 million hectares globally, producing an estimated 6 million tons annually, with India, Myanmar, China, and Indonesia dominating the market. As a legume, it fixes atmospheric nitrogen through symbiosis with rhizobia, improving soil fertility and providing nitrogen inputs for subsequent crops, which makes it especially valuable in resource-limited farming systems. In Ethiopia, mung bean is an emerging crop concentrated in the North Shewa and South Wollo zones of the Amhara region and parts of Benishangul-Gumuz. Yet productivity remains stubbornly low: traditional varieties average about 0.5 megagrams per hectare, improved varieties can exceed 1.5 megagrams under optimal conditions, and the national average of 0.9 megagrams per hectare sits roughly 20 percent below the world average. Unpredictable rainfall, fungal pathogens, pests, poor agronomic practices, and limited access to quality inputs all conspire to hold yields back.

That combination of biotic and abiotic pressures is precisely where endophytic bacteria enter the picture. Endophytes are microorganisms that live within plant tissues without causing disease, and they can benefit their hosts in two broad ways. Direct growth promotion occurs through the production of phytohormones, improved nutrient mobilization, and the induction of systemic tolerance to environmental stress. Indirect protection comes through competitive exclusion of pathogens and the secretion of antimicrobial metabolites such as lipopeptides, polyketides, and volatile organic compounds. Fungal pathogens like Aspergillus flavus pose a particularly serious threat because they produce aflatoxins that contaminate seeds and endanger human and animal health, making biocontrol agents that can target this fungus a priority for both food security and food safety.

To find candidate microbes, the team grew fifty Shewa-type mung bean seeds in vertisol soil at Addis Ababa Science and Technology University without any chemical fertilizers, irrigating weekly over three months until the plants reached the fruiting stage. They then collected fifty healthy root systems and fifty seeds and subjected them to a rigorous surface sterilization protocol involving sequential ethanol and sodium hypochlorite treatments. Crucially, the researchers validated the sterilization using two complementary methods: imprinting sterilized tissues onto nutrient agar plates and spread-plating the final rinse water. Only samples showing zero visible microbial growth after overnight incubation were used, ensuring that the bacteria recovered genuinely lived inside the plant tissues rather than on their surfaces. Macerated tissues were serially diluted and spread across four different growth media to capture as broad a range of the culturable endophytic community as possible.

The isolation effort yielded twenty-eight distinct bacterial endophytes, with more recovered from seeds, sixteen, than from roots, twelve, a distribution suggesting that seed-associated microbiomes may facilitate vertical transmission of beneficial bacteria across generations. Eight representative isolates, selected for their morphological diversity and labeled GMB R1, R2, S1 through S6, were chosen for detailed characterization. Biochemical profiling revealed that three isolates were Gram-positive while five were Gram-negative, all produced catalase, and all fermented glucose. Stress tolerance screening then uncovered a striking spectrum of resilience. Four isolates, GMB R1, R2, S5, and S6, showed robust thermotolerance, maintaining optical densities above 0.58 at 45 degrees Celsius, while others were thermosensitive and grew poorly above 37 degrees. GMB R2 displayed exceptional pH flexibility, losing less than 15 percent growth across the full range from pH 4 to pH 10, and GMB S5 proved the strongest halotolerant strain, sustaining growth at sodium chloride concentrations as high as 12 percent.

Heavy metal tolerance added another dimension to the functional portrait. When grown in media amended with lead acetate at concentrations from 50 to 300 micrograms per milliliter, all isolates grew at the baseline level, but growth inhibition increased with concentration in a strain-dependent manner. GMB R1 stood out as the most lead-tolerant, maintaining strong optical density across the entire gradient, with GMB R2 and GMB S5 close behind. The authors suggest that mechanisms such as exopolysaccharide production, metal sequestration, and efflux systems likely underpin this tolerance, and they highlight the strains as candidates for colonizing plants in heavy metal-contaminated agricultural soils, a growing problem in many intensively farmed regions.

The biocontrol results may prove the most immediately compelling. In dual culture assays on malt extract agar, GMB R1 and GMB R2 significantly suppressed Aspergillus flavus, reducing fungal mycelial growth by 66.7 percent and 73.3 percent respectively, compared with control colony diameters of 4.5 millimeters after seven days. Enzymatic profiling revealed strain-specific specialization that could contribute to this antagonism: GMB R1 showed the highest cellulase activity with an enzymatic index of 2.5, GMB R2 the highest chitinase activity at 1.6, and GMB S5 the highest protease activity at 2.0. Chitinase is particularly relevant to antifungal action because chitin is a structural component of fungal cell walls. Siderophore production, which starves pathogens of iron, was detected in seven of the eight isolates, and six isolates produced ACC deaminase, an enzyme that lowers plant ethylene levels and helps seedlings withstand stress. Notably, the study found no trade-off between stress adaptation and biocontrol capacity, meaning the hardiest strains were also among the best fungal antagonists.

Molecular identification using 16S rRNA gene sequencing confirmed the taxonomy of three key isolates: GMB R1 matched Pseudomonas fluorescens with 99.87 percent similarity, GMB R2 showed 100 percent identity with Pantoea agglomerans, and GMB S5 aligned fully with Serratia marcescens. Sequencing failed for the remaining five isolates, likely due to suboptimal DNA template quality, so those strains are currently identified only by morphological and biochemical profiles, a limitation the authors candidly acknowledge. Partial 16S rRNA sequences for the three characterized strains have been deposited in NCBI GenBank under accession numbers OR974898.1, OR974899.1, and OR974900.1, and phylogenetic analysis using the maximum-likelihood method with 1,000 bootstrap replicates supported their taxonomic placements.

Perhaps the most eye-catching numbers come from the plant growth assays, conducted not on mung bean itself but on wheat (Triticum aestivum) and rapeseed (Brassica napus), demonstrating cross-host efficacy. In germination tests, GMB S6 increased wheat seedling radicle length to 12.4 centimeters and plumule extension to 18.9 centimeters, producing a vigor index of 3,067.4, roughly 140 percent above the uninoculated control. In pot trials over 90 days, GMB S5 produced wheat roots 77 percent longer than controls with an 85 percent increase in root dry weight. On rapeseed, GMB R1 extended radicle length by 149 percent and achieved a vigor index of 2,114.6, an 82 percent improvement, while GMB R2 generated the longest plumules at 9.1 centimeters and boosted rapeseed plumule length by 127 percent. Germination rates stayed high across all treatments, between 94 and 97 percent, indicating that the bacteria enhanced post-germinative development rather than germination itself. One isolate, GMB S2, actually inhibited plumule growth, a reminder that endophyte effects are strain- and context-dependent and that not every endophyte is benign or beneficial.

The authors are careful to frame the work as an exploratory baseline rather than a field-ready prescription. The sampling came from a single site and a single cultivar, physiological assays relied on optical density rather than viable cell counts, heavy metal testing used only lead as a model contaminant, and the inoculated bacteria were not re-isolated from wheat and rapeseed tissues to confirm true endophytic establishment. Field conditions, with competition from indigenous microbiota and environmental variability, will likely produce more modest gains than the laboratory and greenhouse results suggest. Still, the combination of thermotolerance, halotolerance, heavy metal resistance, siderophore production, lytic enzymes, ACC deaminase activity, antifungal activity against aflatoxigenic fungi, and cross-host growth promotion makes GMB R1, GMB R2, and GMB S5 stand out as promising multifunctional bioinoculants. Future work, including whole-genome sequencing, testing on the native mung bean host, consortium design, and multi-location randomized field trials, will determine whether these Ethiopian endophytes can translate their laboratory performance into real yields for marginal agroecosystems, where the need for sustainable alternatives to chemical inputs has never been greater.

Subject of Research: Stress-tolerant endophytic bacteria isolated from Ethiopian mung bean with biocontrol and plant growth-promoting traits

Article Title: Stress-resilient endophytic bacteria from mung bean (Vigna radiata L.) with biocontrol and plant growth-promoting potential

Article References: Abatenh, E., Kebede, M., & Abda, E. M. (2026). Stress-resilient endophytic bacteria from mung bean (Vigna radiata L.) with biocontrol and plant growth-promoting potential. International Microbiology. https://doi.org/10.1007/s10123-026-00897-y

Image Credits: AI Generated

DOI: 10.1007/s10123-026-00897-y

Keywords: endophytic bacteria, mung bean, Vigna radiata, biocontrol, Aspergillus flavus, plant growth promotion, Pseudomonas fluorescens, Pantoea agglomerans, Serratia marcescens, abiotic stress tolerance, aflatoxin, sustainable agriculture

Soils and their microbiota are highly susceptible to climatic disruption, and a large-scale metagenomics study has revealed how the global distribution of bacterial plant pathogens is shaped by environmental conditions. Warm ecosystems and intensively managed agricultural soils favour pathogen prevalence, while colder climates, higher soil organic carbon content, and greater microbial diversity are associated with lower pathogen abundance. The study identified 32 globally dominant phytopathogens, including species from genera such as Agrobacterium, Clavibacter, Ralstonia, Burkholderia, Pseudomonas, and Xanthomonas. These dominant pathogens carry enriched genes related to plant interaction processes, including signalling, sugar transport, energy production, and carbohydrate metabolism, evidence of a deeply adapted plant-associated lifestyle. Crucially, the research reinforces the idea that the capacity of soils to suppress disease is not an intrinsic property of soil itself but is driven by key microbial constituents, including arbuscular mycorrhizal fungi and members of the Actinomycetota and Bacillota phyla, whose genetic potential to produce bioactive secondary metabolites plays an important protective role. Predictive models built on these data suggest that climate change may accelerate the global spread of important bacterial phytopathogens, making surveillance and targeted biocontrol deployment increasingly urgent.

The consequences of a changing climate extend far beyond crop pathogens. Drought, in particular, has emerged as a powerful selective pressure with surprising effects. By 2050, an estimated 5 billion people are expected to live in water-scarce regions as agricultural water demand doubles and freshwater availability may decline by up to half. New research examining drought across different land uses and geographic regions shows that reduced soil water content can increase the concentrations of naturally occurring antibiotics in the soil matrix, independent of the expression of antibiotic biosynthetic genes. Under severe drought, this is associated with a higher abundance of microbial genes involved in both antibiotic biosynthesis and resistance, shifting the functional composition of soil communities toward more resistant phenotypes. Projections indicate that climate change is likely to drive increased antibiotic resistance across all inhabited continents, linking agricultural and public health challenges in ways that scientists are only beginning to appreciate.

Amid this backdrop, agricultural management practices emerge as critical modulators of plant resilience. Long-term comparisons between conventional farming, characterised by high agrochemical inputs, intensive soil disturbance, and simplified rotations, and integrated management, which incorporates reduced tillage, biostimulants, and plant-derived extracts, show that integrated practices can improve key soil properties such as phosphorus availability, water content, and carbon-to-nitrogen ratios. These practices also reshape microbial communities toward taxa with stress-adaptive traits, including an enrichment of spore-forming Bacillaceae bacteria that alleviate plant drought stress under greenhouse conditions. The findings support the ‘cry for help’ hypothesis, whereby plants actively recruit beneficial microbes in response to biotic and abiotic stresses to enhance their own resilience. However, evidence from controlled experimental systems still requires validation under more realistic field conditions before broad generalisation.

One of the most promising frontiers is the rational design of synthetic microbial communities, or SynComs. These engineered consortia are being developed to help plants cope with salinity, heat, nutrient limitations, heavy metals, and even nanoplastic phytotoxicity. Recent work drew on desert plants as a source of drought-adapted microbiomes, constructing SynComs of up to 15 functionally distinct drought-tolerant strains. Applied to major crops under drought stress, these consortia promoted growth more effectively than individual isolates in both sterile and non-sterilised field soils. Their application induced compositional shifts in rhizosphere communities and activated plant physiological responses, including signalling, antioxidant defence, and osmotic adjustment pathways. Yet significant questions remain about the long-term stability of SynComs, their integration with native microbial communities, and their ecological impacts after repeated application, particularly under the increasingly variable conditions imposed by climate change.

Biocontrol agents, living organisms deployed against pathogens, offer distinct advantages over synthetic pesticides. They leave no persistent residues in soil, water, or food, have a lower energy footprint, and are generally highly specific, preserving beneficial soil microbiota that underpin resilience to drought and salinity. Bacteriophage applications, including phage cocktails, are well documented as synergistic tools against bacterial plant diseases, while emerging research explores hypovirulence-associated mycoviruses for fungal pathogen control. Soil microbes themselves are a treasure trove of bioactivity: a literature review covering 2018 to 2025 identified more than 320 natural products from soil-associated taxa, and comparative metabolomic and genomic profiling of approximately 60 actinomycete strains has linked specific bioactive metabolites to disruptions in the mycelial growth and zoospore germination of Phytophthora infestans, the causal agent of potato late blight. Equally striking, the mycoparasitic fungus Paraphaeosphaeria minitans, isolated from sclerotia, produced antifungal compounds and reduced cabbage head rot incidence under field conditions to levels comparable with fungicide treatments.

Engineering microbes to enhance biocontrol is a delicate balancing act, however. One recent study modified a plant-associated Bacillus subtilis strain to overproduce surfactin, an antimicrobial lipopeptide, to combat Fusarium banana wilt. The result was instructive: surfactin overproduction caused pleiotropic effects on the bacterium, impairing motility and biofilm formation, which ultimately reduced plant colonisation and biocontrol efficacy. A moderate increase in surfactin promoted kin-selective recruitment of helpful microbes, but hyperproduction reduced community diversity and disease suppression. The lesson is clear, biocontrol strategies must consider not only pathogen suppression but also dosage-dependent ecological effects on the wider microbial community.

Perhaps the most futuristic of the emerging technologies involves extracellular vesicles, tiny membrane-bound packets that microbes and plants alike use for communication and warfare. Phytophthora infestans deploys EVs to deliver effector proteins into host cells, while plants produce EVs as part of their defence responses. Researchers have now engineered beneficial B. subtilis and Pseudomonas putida strains to produce EVs encapsulating antifungal double-stranded RNAs targeting Botrytis cinerea and Verticillium dahliae. These vesicles were transported into fungal cells, and treatment with either purified vesicles or the engineered bacteria significantly reduced infections in both model and crop plant systems. This cross-kingdom RNA delivery offers a promising route to overcome the nucleic acid degradation challenges that have limited RNA-based antifungal approaches, although the diverse cargo carried by bacterial EVs implies broad ecological functions that must be carefully evaluated before responsible deployment.

The road from laboratory to field remains challenging. Extreme climate events have already caused an estimated US$4.3 trillion in global economic losses over recent decades, with staple crops such as maize, wheat, potato, and rice showing up to 27% of observed yield variability attributable to extremes. The biofertiliser market, currently valued between US$2.9 billion and US$3.72 billion and growing at more than 10% annually, reflects commercial momentum, with databases listing over 280 microbial biostimulant products. Yet regulatory bottlenecks persist, particularly in the European Union, where living products are governed by fragmented frameworks and RNA interference-based crop protection faces divergent rules across countries. From technology readiness perspectives, microbial inoculants are the most mature, phage applications and SynComs are evolving, while extracellular vesicles, RNA delivery systems, and nano-enabled microbiomes remain at the proof-of-concept stage. With supportive policies such as the European Green Deal aiming to halve chemical pesticide use by 2030, researchers argue that integrated microbial technologies, deployed under coherent regulatory frameworks, could transform agriculture into a more resilient, climate-adaptive system aligned with the United Nations Sustainable Development Goals.

Subject of Research: Climate change impacts on plant-microbe interactions and emerging biocontrol and microbiome engineering strategies for sustainable crop production

Article Title: Toward Sustainable Crop Production in a Changing Climate: Microbiomes, Pathogens, Biostimulants and Biocontrol Innovations

Article References: Holmes, A., & Matilla, M. A. (2026). Toward Sustainable Crop Production in a Changing Climate: Microbiomes, Pathogens, Biostimulants and Biocontrol Innovations. Microbial Biotechnology, 19(9), Article e70442. https://doi.org/10.1111/1751-7915.70442

Image Credits: AI Generated

DOI: 10.1111/1751-7915.70442

Keywords: climate change, plant microbiomes, phytopathogens, biocontrol, synthetic microbial communities, extracellular vesicles, antibiotic resistance, biostimulants, drought stress, soil health, sustainable agriculture, bacteriophages

The sequencing effort produced a single circular chromosome of 3,929,792 base pairs with a GC content of 46.5 percent, a size and composition typical of members of the Bacillus subtilis species group but notable for its completeness and quality. Annotation of the genome identified 3,781 protein-coding genes, alongside 27 ribosomal RNA genes, 86 transfer RNA genes and 5 non-coding RNA genes, indicating a highly functional translational apparatus consistent with a fast-growing, metabolically versatile organism. Beyond the core gene complement, the researchers detected four genomic islands, four prophages and four CRISPR sequences, features that speak to a dynamic evolutionary history shaped by horizontal gene transfer and viral assault. Prophages can carry genes that influence host physiology and competitiveness, while CRISPR arrays record past encounters with invading genetic elements, together providing a fingerprint of the ecological pressures this bacterium has survived within its plant host.

The most striking discovery, however, lies in the bacterium’s chemical arsenal. ML21’s genome harbors no fewer than twelve secondary metabolite gene clusters, the genetic blueprints for complex molecules that microbes use to compete, defend and communicate. Seven of these clusters show high similarity, either 100 percent or 82 percent, to known clusters responsible for synthesizing some of the most celebrated antimicrobial compounds in the Bacillus repertoire: the nonribosomal lipopeptides surfactin, fengycin and bacilysin, and the polyketides difficidin, macrolactin H and bacillaene. Each of these molecules has an established reputation in the biocontrol literature. Surfactin is a powerful biosurfactant that disrupts bacterial membranes and can induce systemic resistance in plants. Fengycin attacks fungal cell membranes and is considered one of the most potent antifungal lipopeptides produced by Bacillus species. Bacilysin, a simple dipeptide antibiotic, interferes with protein synthesis in competing bacteria. Difficidin and macrolactin are broad-spectrum polyketide antibiotics, while bacillaene inhibits protein synthesis in prokaryotes, quietly suppressing microbial rivals before they can establish infection.

The fact that these clusters are present together in a single genome explains much of ML21’s observed potency in laboratory antagonism assays. Rather than relying on one mechanism, the strain deploys a layered defense: lipopeptides that puncture membranes, polyketides that sabotage protein production, and siderophores that starve competitors of iron. Two siderophore clusters, those for bacillibactin and butirosin A/B, were also identified, although they showed much lower similarity to reference sequences, at only 7 percent, hinting at possible structural variation worth further biochemical investigation. Siderophores are small molecules that chelate iron in the environment, and by sequestering this essential nutrient, biocontrol bacteria can deprive pathogens of a resource they need to grow and cause disease.

Perhaps the most tantalizing aspect of the study is the identification of four completely novel secondary metabolite clusters, predicted to encode two terpenes, one lanthipeptide and one polyketide. Terpenes are a vast and chemically diverse class of natural products, many of which possess antimicrobial or signaling properties. Lanthipeptides are members of the ribosomally synthesized and post-translationally modified peptide family, whose members often exhibit potent antibacterial activity through novel mechanisms. The existence of uncharted biosynthetic machinery in ML21 raises the possibility of entirely new antimicrobial compounds waiting to be isolated and characterized, a prospect that will interest natural product chemists as much as agricultural scientists. In an era when antibiotic discovery has slowed to a trickle and resistance genes are spreading across pathogens of both plants and humans, the genomes of environmental and endophytic bacteria have become one of the most promising hunting grounds for new chemistry.

ML21 is not only a fighter; it is also a gardener. The genome contains genes implicated in promoting plant growth, including trpC, which participates in the biosynthesis of indole-3-acetic acid, the principal auxin hormone that stimulates root development and overall plant vigor, and acoA, involved in producing acetoin, a volatile organic compound known to elicit induced systemic resistance in plants. Acetoin emitted by rhizobacteria has been shown to prime plant immune defenses, effectively vaccinating the host against subsequent pathogen attack. The presence of both direct growth promotion genes and defense-triggering pathways suggests that ML21 may benefit its host through multiple simultaneous routes: improving nutrient uptake and hormonal balance while actively suppressing disease organisms and stimulating the plant’s own immune responses.

The ecological context of ML21 adds further weight to these findings. As an endophyte isolated from mango fruit, the bacterium lives inside plant tissue, a privileged niche where it can interact closely with its host and with pathogens attempting the same invasion. Mango cultivation suffers from serious bacterial and fungal diseases, including bacterial black spot caused by Xanthomonas citri pv. mangiferaeindicae, a pathogen whose genome has been sequenced in recent years, as well as postharvest rots that cause substantial losses between orchard and market. The authors’ earlier work had shown that ML21 inhibits a variety of rice pathogens as well, suggesting a broad host-relevant activity that could extend beyond a single crop. The new genome sequence now provides the mechanistic explanation: a dense concentration of antimicrobial biosynthetic clusters that few competing pathogens could easily withstand simultaneously.

The broader significance of the study lies in the mounting scientific and commercial interest in Bacillus velezensis as a biocontrol agent. The species has emerged over the past decade as one of the most promising candidates for replacing or reducing synthetic pesticides and chemical fertilizers in sustainable agriculture. Its spore-forming ability allows formulation into stable products with long shelf life, its lipopeptides degrade readily in the environment, and its plant growth-promoting traits offer yield benefits alongside disease suppression. By providing the complete genome of a fruit-derived endophytic strain, the Guangxi team has added a valuable reference resource for comparative genomics, enabling researchers to pinpoint the genetic differences that determine why some strains are exceptional antagonists while close relatives are not. The genome has been deposited in GenBank under accession number NZ_CP150636, making it freely available to the research community.

Looking ahead, the genomic blueprint of ML21 opens several concrete avenues. The four novel biosynthetic clusters invite heterologous expression or fermentation studies to determine what compounds they actually produce and whether those molecules are active against pathogens. The complete set of lipopeptide and polyketide genes supports targeted strain improvement through metabolic engineering, potentially boosting yields of the most effective antimicrobials. And the combination of biocontrol and plant growth-promoting genes strengthens the case for field trials in mango orchards and rice paddies, where the strain’s dual talents could translate into reduced chemical inputs and healthier harvests. In a small chromosome of fewer than four million base pairs, this mango-dwelling microbe has packed an encyclopedia of defensive chemistry, and scientists are only beginning to read it.

Subject of Research: Complete genome sequencing of the biocontrol endophytic bacterium Bacillus velezensis ML21 isolated from mango fruit

Article Title: Complete genome sequencing of Bacillus velezensis ML21, an endophytic strain from mango fruit with strong inhibitory against bacterial and fungal diseases

Article References: Complete genome sequencing of Bacillus velezensis ML21, an endophytic strain from mango fruit with strong inhibitory against bacterial and fungal diseases. (n.d.). https://doi.org/10.1007/s13205-026-04994-7

Image Credits: AI Generated

DOI: 10.1007/s13205-026-04994-7

Keywords: Bacillus velezensis, whole-genome sequencing, secondary metabolite gene clusters, biocontrol, endophytic bacteria, mango, lipopeptides, surfactin, fengycin, plant growth promotion, sustainable agriculture, plant pathogens

The stakes could hardly be higher. Climate change threatens long-term food security through rising temperatures, shifting precipitation patterns, and a heightened frequency of extreme weather events that disrupt the delicate balance within agricultural systems. Plants today face a barrage of biotic and abiotic stressors—pathogens, drought, salinity, heat, and heavy metal contamination—that affect their physiological, biochemical, and molecular machinery. Against this backdrop, beneficial microorganisms that drive nutrient cycling, maintain soil structure, and bolster plant resilience have moved from the margins of agricultural science to its center. The new collection examines these interactions across an unusually broad canvas, covering the biocontrol of diseases such as Fusarium wilt and yellow rust, the mitigation of salinity and drought stress, carbon sequestration, endophyte-mediated defense, and rhizobacterial strategies for developing climate-resilient crops.

Among the most striking findings comes from the Ethiopian highlands, where wheat yellow rust is the most economically significant wheat disease. A field study by Kusa and colleagues surveyed the prevalence and severity of the disease, caused by the fungus Puccinia striiformis f. sp. tritici, across the highlands of the Guji zone in southern Ethiopia. The results were sobering: yellow rust prevalence reached 100 percent in the Bore and Dama districts and 92 percent in Ana Sora, with Bore recording the highest incidence at 66.4 percent and severity at 58.4 percent. The analysis identified altitude and wheat variety as the most influential factors driving disease intensity, while early planting, heavy weed infestation, and a preceding cereal crop also significantly heightened both severity and incidence. Such epidemiological detail is essential for targeting interventions in a warming world where rust pathogens are expanding into new territories.

Disease resistance breeding features prominently throughout the collection. In Bangladesh, Farthouse and colleagues evaluated blackgram mutants under natural field conditions against three major diseases—Cercospora leaf spot, powdery mildew, and yellow mosaic. Two mutants, BM-63 and BM-42, emerged as clear leaders, displaying moderate resistance to powdery mildew, mixed resistance and susceptibility to the other two diseases, and the highest grain yields of the trial, reaching up to 812.6 kilograms per hectare. Meanwhile, in India, Vinodhini and colleagues used molecular techniques to confirm a mixed infection of chilli leaf curl virus, formally Begomovirus chillicapsici, and a phytoplasma identified as Candidatus Phytoplasma australasiaticum in symptomatic chilli plants in Coimbatore. The work underscores how modern molecular diagnostics are indispensable for untangling complex co-infections that would confound field observation alone.

Computational biology is also contributing to climate-ready crop protection. Das and colleagues performed a comparative in silico analysis of the bacterial blight resistance genes Xa27 and Xa23 in the indica and japonica subspecies of rice. Their genomic survey revealed that the 100-kilobase regions flanking these genes differ between subspecies in gene composition, GC content, and simple sequence repeat motifs, and are rich in pathogen-responsive cis-regulatory elements, particularly ABRE motifs. The team also identified nearby genes involved in cuticular wax biosynthesis, receptor kinases, and other defense mechanisms—structural insights that could guide breeders seeking to stack resistance traits in future rice varieties.

On the beneficial-microbe side of the ledger, the collection documents remarkable successes. In the Sundarbans Delta of India, where soil salinity is rising, Kundu and colleagues showed that inoculating chickpea with the arbuscular mycorrhizal fungus Glomus mosseae improved seedling emergence by 45 percent, plant height by 52 percent, pod number by 95 percent, and seed yield by 48 percent under saline conditions, while enhancing phenolic content, water status, membrane stability, and chlorophyll levels. In tomato, Hasna and colleagues demonstrated that the biocontrol fungus Trichoderma asperellum inhibited Fusarium wilt pathogen growth by up to 90 percent in laboratory assays, reduced disease severity in living plants, and activated a suite of host defense genes including PAL3, PR10, PRS, CH4, and PR4—confirming a dual mechanism of direct antagonism and induced systemic immunity.

Other studies extend the microbial toolkit further. Rawat and colleagues standardized the use of plant growth-promoting bacteria, including Bacillus subtilis and Pseudomonas putida, to biologically harden tissue-cultured plantlets of Valeriana jatamansi, an endangered Himalayan medicinal herb; inoculation with B. subtilis lifted survival rates to 90 percent while boosting plant height, leaf count, biomass, and valuable secondary metabolites such as phenolics and tannins. Bhardwaj and colleagues found that diazotrophic cyanobacteria, notably Anabaena torulosa, alleviated the impact of elevated carbon dioxide on rice by improving soil nitrogen availability, increasing the abundance of nitrogen-fixing microbes, and enhancing nutrient mobilization, growth, and grain yield. Abiala, in a separate contribution, highlighted rhizobacteria genome sequencing as a platform for identifying genes governing osmolyte production, antioxidant systems, and stress signaling—knowledge that can accelerate the design of targeted biofertilizers for drought-stressed food crops.

The collection also confronts the darker side of a changing microbial landscape. Mohan and colleagues identified two novel fungal pathogens, Poitrasia circinans and Neoscirrhia matteucciicola, associated with leaf spot disease in ginger in Meghalaya, India—the first report of these fungi affecting ginger in the region. Sarnaik and colleagues reviewed Fusarium wilt of brinjal, caused by Fusarium oxysporum and F. solani, which can devastate yields by 50 to 80 percent, and advocated integrated management combining crop rotation, biocontrol agents such as Trichoderma and Bacillus, resistant varieties, and reduced fungicide use. A review by Gore and colleagues detailed how endophytic microbes suppress pathogens directly through antimicrobial metabolites, enzymes, and siderophores, and indirectly by activating systemic acquired resistance and induced systemic resistance pathways, offering a sustainable alternative to chemical pesticides.

Beyond microbes, the collection addresses broader sustainability questions. Mafirakurewa and Mutanda assessed the carbon sequestration potential of climate-smart finger millet, whose deep roots, drought resistance, and continuous photosynthesis generate substantial biomass and enrich soil carbon even on marginal land, though adoption remains constrained by weak policy support and market incentives. A systematic review of Good Agricultural Practices in Bangladesh found that such approaches could reduce agrochemical runoff by up to 40 percent and improve water quality, yet standards, extension services, financing, and marketing challenges impede wider uptake. Complementary work by Kumar and colleagues catalogued plant growth-promoting bacteria associated with Salvadora species—dominated by Pseudomonas and Bacillus strains producing indole-3-acetic acid, solubilizing minerals, forming biofilms, and generating siderophores and ammonia—while Arif and colleagues showed that combined zinc and boron application at 15 to 20 milligrams per kilogram significantly enhanced growth, chlorophyll, phenolics, protein, nutrient uptake, and heavy metal tolerance in Brassica rapa.

Taken together, the collection advances knowledge at the intersection of climate science, microbiology, and agriculture, offering essential insights for adaptive farming systems that safeguard plant protection and long-term productivity. The editors emphasize that microorganisms acquire specific metabolic capabilities in relation to their host plants, producing interactions that can be positive, neutral, or negative—and that climate-driven shifts in microbial diversity and function may either amplify or erode these benefits. Understanding how climate change reshapes microbial dynamics is therefore crucial. From the rust-swept wheat fields of Ethiopia to the saline paddies of the Sundarbans, the message is consistent: the future of sustainable agriculture may depend less on new chemistry than on cultivating the ancient partnerships between plants and the microbes that sustain them.

Subject of Research: Plant–microbe interactions under climate change for sustainable agriculture and plant protection

Article Title: Plants and microbes under climate change: an interaction for sustainable agriculture and plant protection

Article References: Mitra, D., Rani, A., & Anđelković, S. (2026). Plants and microbes under climate change: an interaction for sustainable agriculture and plant protection. Discover Plants, 3(1), Article 390. https://doi.org/10.1007/s44372-026-00847-y

Image Credits: AI Generated

DOI: 10.1007/s44372-026-00847-y

Keywords: plant-microbe interactions, climate change, sustainable agriculture, plant protection, biocontrol, mycorrhizal fungi, plant growth-promoting bacteria, endophytes, drought stress, salinity tolerance, Fusarium wilt, carbon sequestration

Rice blast has long been regarded as the most important fungal disease of rice, a staple crop that feeds roughly half of the global population. The pathogen, Magnaporthe oryzae, infects leaves, stems, and panicles, producing the characteristic diamond-shaped lesions that can decimate yields under favorable humid conditions. Conventional control relies heavily on fungicide applications and the deployment of resistance genes in cultivars, but the fungus is notorious for its adaptive capacity, repeatedly overcoming single resistance genes in the field. This has driven scientists to look beyond the plant’s own genome for partners in defense, and the rhizosphere microbiome has emerged as a compelling frontier.

The rhizosphere—the narrow zone of soil influenced by root exudates—harbors some of the densest and most metabolically active microbial communities on Earth. Plant roots actively recruit and nourish specific microbes through the release of sugars, organic acids, and signaling compounds, and in return, certain bacteria can suppress pathogens, modulate plant hormones, or prime immune responses. Whether the rhizosphere communities of disease-resistant rice cultivars are fundamentally different from those of susceptible ones, and how those communities respond when the blast pathogen attacks, had remained incompletely resolved. The new greenhouse study set out to answer precisely those questions.

The research team, led by Tingting Yang and Di Han of the College of Plant Protection at Shenyang Agricultural University, together with colleagues at Liaoning Academy of Agricultural Sciences, grew blast-resistant and blast-susceptible rice cultivars under controlled greenhouse conditions and compared their rhizobacterial communities both before and after challenge with M. oryzae. Using 16S rDNA amplicon sequencing—a technique that catalogs bacterial taxa by amplifying a conserved genetic marker—they profiled the diversity and composition of the root-associated bacteria across the experimental treatments.

The sequencing results revealed statistically significant differences in rhizobacterial diversity and community composition between resistant and susceptible cultivars, confirming that the plant genotype leaves a measurable imprint on which bacteria congregate around its roots. More striking was what happened after pathogen infection: both cultivar types underwent distinct community shifts, but the direction and magnitude of those shifts differed between resistant and susceptible plants. The researchers detected differential microbial enrichment patterns across cultivars and disease states, indicating that the rhizosphere is not a passive bystander in the rice–blast interaction but a dynamic environment that responds to both plant genotype and pathogen pressure.

Among the taxa whose abundance changed, one genus stood out. Bacillus species were consistently enriched in the rhizospheres of healthy plants of resistant cultivars and, tellingly, in infected plants of susceptible cultivars. This dual pattern suggests that Bacillus populations may be associated with disease status in both contexts—either helping to maintain health in resistant plants or responding to infection in susceptible ones. Bacillus species are well known in agricultural microbiology for their ability to produce antimicrobial compounds, form protective biofilms on roots, and induce systemic resistance in host plants, which makes their enrichment patterns particularly noteworthy for biocontrol-oriented research.

To probe the structure of these microbial communities more deeply, the team applied network analysis, a computational approach that maps co-occurrence and potential ecological interactions among taxa. The analysis showed that cultivar resistance was associated with measurable differences in the architecture of the rhizosphere microbial community. In practical terms, resistant and susceptible rice varieties appear to host rhizobacterial networks with different organization, hinting that community structure—not merely the presence or absence of particular species—may contribute to the disease-suppressive potential of the root environment.

The study then moved from community profiling to the isolation and characterization of individual candidates. From the rhizosphere of healthy rice plants, the researchers recovered a bacterial strain designated Bacillus velezensis H2. The strain was characterized through a combination of morphological and biochemical tests, 16S rRNA gene sequencing, and single-nucleotide polymorphism (SNP) profiling to confirm its taxonomic identity. B. velezensis is a species that has attracted considerable attention in biocontrol research because many of its strains carry extensive biosynthetic machinery for antimicrobial secondary metabolites.

Whole-genome analysis using the antiSMASH platform—an algorithmic pipeline that scans bacterial genomes for biosynthetic gene clusters—identified multiple clusters in the H2 genome involved in secondary metabolite production. Among these were genes encoding nonribosomal peptide synthetases, the giant multifunctional enzymes responsible for assembling many of the lipopeptide antibiotics that Bacillus species are famous for, such as members of the surfactin, iturin, and fengycin families. The presence of these clusters provides a genomic rationale for the strain’s observed biological activity and suggests that H2 is genetically equipped to interfere with fungal pathogens in the root zone.

Laboratory assays confirmed that promise in practice. In vitro tests demonstrated that B. velezensis H2 exhibits strong antifungal activity against Magnaporthe oryzae, directly inhibiting the growth of the blast pathogen. While in vitro inhibition does not guarantee field-level disease suppression—greenhouse and field validation remain essential next steps—the combination of rhizosphere origin, rich biosynthetic potential, and demonstrable antagonism makes H2 a compelling candidate for development as a biocontrol agent. If it can colonize rice roots effectively and express its antifungal arsenal under realistic soil conditions, it could contribute to reducing the chemical fungicide burden in rice production systems.

The broader significance of the study lies in its integrated perspective. Rather than treating plant immunity and the microbiome as separate domains, the work links cultivar resistance, rhizobacterial community structure, pathogen-induced shifts, and a concrete antagonistic isolate into a single narrative. It reinforces a growing consensus in plant pathology: breeding for resistance and engineering beneficial microbiomes may be complementary strategies. Rice blast remains a moving target, but evidence that resistant cultivars cultivate distinct and potentially protective bacterial communities—and that strains like B. velezensis H2 can directly oppose the pathogen—offers a scientifically grounded path toward more sustainable, microbiome-aware crop protection.

Subject of Research: Rhizosphere bacterial community shifts in rice blast-resistant cultivars and the antagonistic activity of Bacillus velezensis against the rice blast pathogen

Article Title: Rhizosphere Bacterial Community Shifts in Rice Blast–Resistant Cultivars and the Antagonistic Activity of Bacillus velezensis

Article References: Yang, T., Han, D., Ding, A., Du, S., Wang, W., Huang, Y., & Ahsan, T. (2026). Rhizosphere Bacterial Community Shifts in Rice Blast–Resistant Cultivars and the Antagonistic Activity of Bacillus velezensis. Microbial Ecology. https://doi.org/10.1007/s00248-026-02858-4

Image Credits: AI Generated

DOI: 10.1007/s00248-026-02858-4

Keywords: rhizosphere microbiome, rice blast disease, Bacillus velezensis, Magnaporthe oryzae, biocontrol, 16S rDNA sequencing, secondary metabolites, nonribosomal peptide synthetases, antiSMASH, disease resistance, Rhizosphere, Bacterial

Bacteriophages, the viruses that infect and kill bacteria, were first explored as therapeutic agents in the early twentieth century, shortly after their discovery by Frederick Twort and Félix d’Hérelle. While Western medicine largely abandoned the approach after the arrival of antibiotics, parts of Eastern Europe and the former Soviet Union never stopped using it. The new review, authored by a large consortium of researchers led by Roman Pantůček and Jiří Doškař of Masaryk University in Brno, documents how the Czech lands participated in this long tradition and how that historical foundation has been systematically rebuilt and modernized since the year 2000.

The review’s authors describe a national ecosystem in which academic institutions, biotechnology companies, and university hospitals work in parallel rather than in isolation. According to their analysis, more than 30 competitively funded research projects have been launched in the Czech Republic since 2000, addressing the central technical challenges that stand between laboratory phage research and routine clinical use. These projects have tackled phage safety assessment, genomic characterization of therapeutic candidates, formulation and delivery strategies, synergy between phages and conventional antibiotics, and the difficult problem of manufacturing phage preparations under Good Manufacturing Practice, the regulatory quality standard required for medicines.

The technical depth of this national effort is considerable. Genomic characterization, for example, is now understood as a non-negotiable prerequisite for any phage intended for human use, since phage genomes can harbor toxin genes or other undesirable cargo, and whole-genome sequencing allows candidate viruses to be screened before they ever reach a patient. The Czech teams have applied these methods extensively to staphylococcal phages, an area in which Masaryk University researchers have long specialized, reflecting the country’s historical focus on Staphylococcus aureus infections and conditions such as osteomyelitis, a stubborn bone infection that is notoriously difficult to treat with antibiotics alone and where topical phage preparations such as the long-standing Czech product Stafal found early application.

Stafal itself occupies an important place in the review’s historical narrative. Developed and produced in Czechoslovakia for decades, the staphylococcal phage preparation was used in the treatment of bacterial infections and became one of the few phage products in Europe with continuous production and clinical availability across the political upheavals of the twentieth century. Its survival into the modern era gave Czech researchers and clinicians a continuity of practical experience that few other Western or Central European countries can claim, and it served as a bridge between the empirical phage medicine of the past and today’s evidence-based, molecularly characterized approaches.

Clinical translation is now advancing along two complementary tracks. The first is treatment on a named-patient basis, a compassionate framework that allows physicians to administer phage preparations to individual patients with severe, otherwise untreatable infections, often under national regulations that accommodate unlicensed medicines when no authorized alternative exists. The second track consists of formal clinical trials, which the review describes as ongoing. Moving from anecdotal case reports to controlled studies is widely regarded by the phage therapy community as the decisive step toward regulatory acceptance, and the Czech combination of clinical partners and domestic GMP-compliant production places the country in a strong position to generate the kind of standardized evidence that regulators require.

The review also emphasizes that the Czech phage effort extends well beyond human medicine. In veterinary practice, phages have been investigated as alternatives to antibiotics in livestock, where reducing antimicrobial use has become a priority both for controlling resistance and for meeting European policy targets. In agriculture, researchers have explored phage-based biocontrol of plant pathogenic bacteria, an application studied at the Czech Academy of Sciences’ plant virology institute in České Budějovice. Food safety represents a third area of application, with phages offering a way to reduce pathogenic bacteria on food products without chemical residues. Together these sectors demonstrate a breadth of phage expertise that reinforces the human medicine pipeline, since methods for phage isolation, characterization, and formulation are largely transferable across applications.

Structural biology has added a distinctive dimension to the national program. At the Central European Institute of Technology in Brno, researchers including Pavel Plevka and Tibor Füzik apply cryo-electron microscopy to determine the atomic structures of phage particles, revealing how these viruses recognize their bacterial hosts and deliver their genetic material. Such structural insight is increasingly relevant to rational phage engineering, in which viruses are modified to broaden their host range, evade bacterial defense systems, or improve their stability in pharmaceutical formulations. The presence of world-class structural biology alongside classical phage biology and industrial production is precisely the kind of interdisciplinary integration the review identifies as a national strength.

Looking forward, the authors identify several priorities that will determine whether Czech phage therapy can move from promising practice to sustainable standard of care. Sustainable access to standardized phage preparations is paramount: phage therapy is inherently individualized, because phages must be matched to the specific bacterial strain infecting each patient, and bacteria can evolve resistance to individual phages, so therapeutic preparations typically consist of carefully designed cocktails of multiple viruses. Maintaining libraries of well-characterized phages, updating them in response to evolving bacterial populations, and producing them reproducibly under GMP conditions is logistically and financially demanding in ways that conventional small-molecule antibiotics are not. The review argues that this challenge must be addressed within the rapidly evolving European regulatory framework, which is only now beginning to define how individualized biological therapies should be assessed, authorized, and reimbursed.

The broader significance of the Czech experience extends across the continent. As antimicrobial resistance is projected to cause millions of deaths annually in the coming decades, European health systems are actively searching for non-traditional antibacterial therapies, including enzybiotics, phage-derived enzymes that degrade bacterial cell walls, alongside whole-phage treatments. The review’s conclusion is that the Czech Republic has established the substantial expertise and infrastructure needed to serve as an important European contributor to this effort, offering a working model of how a long national tradition, when combined with modern genomics, structural biology, regulatory engagement, and industrial capability, can be transformed into a coherent pathway for integrating phage-based interventions into twenty-first-century healthcare.

Subject of Research: Phage therapy research, clinical practice, and development in the Czech Republic as a contribution to phage therapy in Europe

Article Title: Past and present phage therapy research and practice in the Czech Republic – contribution to phage therapy in Europe

Article References: Pantůček, R., Doškař, J., Boštík, J., Kocourková, D., Petrzik, K., Koptíková, J., Benešík, M., Plevka, P., Füzik, T., Mašlaňová, I., Botka, T., Nepeřený, J., Zeller, D., Kuntová, L., Snopková, K., Hrala, M., & Moša, M. (2026). Past and present phage therapy research and practice in the Czech Republic – contribution to phage therapy in Europe. Virology Journal. https://doi.org/10.1186/s12985-026-03296-x

Image Credits: AI Generated

DOI: 10.1186/s12985-026-03296-x

Keywords: phage therapy, bacteriophages, antimicrobial resistance, Czech Republic, Staphylococcal infections, Stafal, GMP manufacturing, clinical trials, enzybiotics, biocontrol, osteomyelitis, phage-antibiotic synergy

The case for alternatives to conventional treatments is pressing. Chemical pesticides, although effective and easy to manufacture, contaminate soil, leach toxic compounds into groundwater and disrupt beneficial microbial communities that naturally suppress pathogens. Copper compounds, a mainstay of orchard sprays, accumulate in the environment, and copper resistance in target bacteria has steadily eroded their value. Antibiotics have fared little better: the global rise of antibiotic resistance and risks to human health have limited agricultural use, and resistance development in phytopathogens undermines long-term efficacy. Concerns extend to pollinators as well, since pesticide exposure and habitat contamination threaten the honeybees on which fruit, nut and oilseed yields depend. Within the European Union, most conventional pesticides and antibiotics are progressively being banned, leaving farmers in urgent need of new tools.

Phages offer an attractive answer because of their exquisite host specificity. They infect and lyse their target bacteria without touching beneficial microorganisms, plants, animals or humans, so applications are not expected to disturb plant or soil microbiota. They also replicate only when sufficient susceptible hosts are present, naturally declining once pathogen populations fall. The team behind the new work built on three virulent phages previously isolated from urban wastewater: ɸEF1 and ɸEF2, which attack E. amylovora, and ɸXF1, which attacks X. campestris. Genomic analysis confirmed that all three follow a strictly lytic cycle, producing transparent plaques and complete host lysis in liquid culture within five to eight hours.

The first task was optimizing infection dynamics. Testing multiplicities of infection (MOI) ranging from 0.01 to 10, the researchers found that higher MOIs offered no significant improvement in pathogen reduction. A MOI of 1 was selected because it produced greater reductions in bacterial density than 0.1 for all three phages. From a manufacturing perspective this matters enormously: low MOIs allow a single concentrated phage stock to be diluted into large-volume formulations, whereas MOIs of 100 or 1000 would require titers of 10^10 to 10^11 plaque-forming units per milliliter, inflating production complexity and cost. Host density also influenced performance, with better bacterial reductions at 10^6 colony-forming units per milliliter than at 10^7. Under the optimized conditions, ɸXF1 delivered the strongest lysis, a 5.5 log10 reduction in host density within four hours, while ɸEF1 and ɸEF2 achieved reductions of 3.5 and 3.8 log10 respectively, with their combined use potentially acting synergistically.

Shelf life was the next hurdle. The phages were stored at 4°C, 20°C and 37°C for six months and enumerated at regular intervals. Both ɸEF1 and ɸEF2 remained stable for the full 180 days at 4°C, with losses close to or below 1 log10 unit, and performed acceptably at 20°C with roughly 2 log10 reductions. At 37°C, however, both declined sharply, falling 8 log10 units by day 150. Phage ɸXF1 was somewhat more fragile, losing about 2 log10 units at 4°C and 3 log10 at 20°C over six months, and becoming undetectable within 28 days at 37°C. Notably, the study is among the first to demonstrate long-term stability of phage formulations at room temperature, a finding with substantial logistical value because it could eliminate the need for costly cold chains or freeze-drying, both of which complicate distribution and can reduce infectious particle counts.

Acidity proved a hard limit. All three phages were inactivated within a single day at pH 3, whereas at neutral and alkaline pH stability rose markedly. ɸEF2 was the sturdiest, losing less than about 1 log10 unit at both pH 7 and pH 9 over six months, while ɸEF1 declined by 1.2 log10 units and ɸXF1 dropped 2.0 log10 at pH 7 and 3.8 log10 at pH 9. These results directly inform formulation choices, since any carrier solution must avoid acidic conditions that would rapidly destroy infectivity before the product even reaches the crop.

The decisive challenge, however, was sunlight. Ultraviolet radiation induces DNA lesions that block phage replication and transcription, and daylight inactivation is widely regarded as the primary obstacle to phage biocontrol in the field. The researchers therefore screened three photoprotective agents already used in agriculture: aminic acid, an acidic protein hydrolysate; Amino 22%, a commercial amino acid-based biostimulant; and Vegepron Sun, a calcium carbonate (CaCO3) foliar fertilizer that forms a reflective film on fruit and leaves. Suspensions were exposed outdoors to full natural sunlight for six hours, with solar irradiance peaking above 700 watts per square meter around midday. Aminic acid failed outright: even after neutralization, phages declined within two hours and became undetectable by four, performing worse than unprotected controls. In contrast, 24 percent CaCO3 kept average reductions to just 0.73 log10 units after six hours, with AA22 providing intermediate protection.

Controlled irradiation under a germicidal 253.7-nanometer UV lamp confirmed the hierarchy. Unprotected phages fell below detection within one hour, but both photoprotectants extended recoverable infectivity to eight hours, and CaCO3 consistently outperformed AA22. With 24 percent CaCO3, all three phages lost only 1.2 to 1.4 log10 units after eight hours of irradiation, compared with 2 to 2.5 log10 at the 12 percent concentration, establishing that the higher formulation offered superior and more consistent shielding. The team then moved to real crop surfaces, inoculating detached pear fruits and cabbage leaves and exposing them to sunlight. Because phage recovery from plant tissue is notoriously inefficient, the group first optimized extraction, finding that homogenization in a 10 percent beef extract solution with a Stomacher blender recovered roughly 76.7 percent of inoculated phages, versus a mere 0.79 percent with phage buffer. On the plants, 24 percent CaCO3 again proved decisive: after six hours of sun exposure, ɸEF1 titers on pears averaged 1.8 log10 units higher with the additive than without, ɸEF2 gained 2.5 log10 units, and ɸXF1 on cabbage leaves showed gains of up to 1.9 log10 units at early time points, while the unprotected suspension dropped below detection within four hours.

The authors argue that these results, combined with the regulatory status of the additives, clear a practical path to commercialization. Because CaCO3 and AA22 are already approved agricultural biostimulants, incorporating them into phage products should face fewer regulatory barriers than novel excipients. Recommended deployment would favor evening spraying to maximize the protective window, with reapplication every five to seven days during high-risk periods or after heavy rainfall, all compatible with Integrated Pest Management frameworks. Only a handful of commercial phage products currently exist for plant disease, including Erwiphage PLUS against fire blight and Biolyse against Xanthomonas in Europe, and Ecofire and AgriPhage elsewhere. By demonstrating room-temperature shelf stability, defined infection parameters and sunlight-protected persistence on crops, the study provides concrete formulation guidance for expanding that market, in line with European Green Deal goals for residue-free food. The researchers caution that greenhouse experiments and multi-season field trials remain necessary to validate efficacy across diverse climates, but the blueprint for a viable phage biopesticide now looks considerably more complete.

Subject of Research: Design of a bacteriophage-based biocontrol product against the fire blight pathogen Erwinia amylovora and the black rot pathogen Xanthomonas campestris

Article Title: Design of a Bacteriophage‐Based Product for Biocontrol of Fire Blight and Black Rot

Article References: Vique, G., Blanco‐Picazo, P., Trenchs, A., Ramos‐Barbero, M. D., Isern, M., Quirós, P., Atares, S., Salaet, I., Sala‐Comorera, L., Rodríguez‐Rubio, L., & Muniesa, M. (2026). Design of a Bacteriophage‐Based Product for Biocontrol of Fire Blight and Black Rot. Microbial Biotechnology, 19(9), Article e70436. https://doi.org/10.1111/1751-7915.70436

Image Credits: AI Generated

DOI: 10.1111/1751-7915.70436

Keywords: bacteriophage, biocontrol, fire blight, black rot, Erwinia amylovora, Xanthomonas campestris, calcium carbonate, UV photoprotection, plant pathology, biopesticide, phage stability, sustainable agriculture