Researchers assessed ToBRFV symptom severity, vegetative growth parameters, the activity of enzymatic and non-enzymatic antioxidants, and the expression of genes associated with pathogenesis. Principal component analysis was used to examine multivariate patterns in growth and antioxidant data across plasma treatments. The abstract reports that the 5-minute treatment produced the greatest differentiation in the principal component analysis.

Plasma-treated plants showed higher antioxidant-related measurements and a lower oxidative-stress index reported as MDA than controls. Peak antioxidant activity and accumulation of defense compounds were observed 14 days after inoculation. The abstract also reports significant increases and peak expression of three defense-related genes: PR1, encoding pathogenesis-related protein 1; PR2, encoding β-1,3-glucanase; and PR5, encoding a thaumatin-like protein.

The reported peak in gene expression occurred particularly in plasma-treated plants 14 days after inoculation. The authors interpreted the results as evidence that plasma treatment can elicit a coordinated defense response in tomato plants. The study concludes that cold plasma may offer a non-chemical approach for eliciting plant defenses, mitigating ToBRFV severity and enhancing plant growth indices in greenhouse cultivation systems.

The reported findings concern greenhouse conditions and plasma-activated water treatments applied for 3, 5 and 10 minutes.

Subject of Research: Effects of cold argon plasma-activated water on ToBRFV symptoms, tomato growth, antioxidants and defense-gene expression in a greenhouse experiment

Article Title: A novel strategy for controlling tomato brown rugose fruit virus and enhancing tomato growth in greenhouses: cold plasma as a non-thermal inhibitor

Article References: Pakbaz, S., Hasanvand, E., & Barjasteh, A. (2026). A novel strategy for controlling tomato brown rugose fruit virus and enhancing tomato growth in greenhouses: cold plasma as a non-thermal inhibitor. BMC Plant Biology. https://doi.org/10.1186/s12870-026-10003-z

Image Credits: AI Generated

DOI: 10.1186/s12870-026-10003-z

Keywords: tomato brown rugose fruit virus, cold plasma, plasma-activated water, greenhouse tomato, plant defense, antioxidants, defense genes, pathogenesis, vegetative growth, novel, strategy, controlling

Researchers compared four growing media: raw tomato stalk waste, tomato stalk waste composted for two months, cocopeat, and a mixture of peat and perlite. The experiment used the tomato cultivar ‘Bandita F1’ and followed a 4 × 3 factorial design combining the four media with three storage periods. It was conducted in a completely randomized design with three independent crate replicates for each combination. Fruit was held in modified-atmosphere packaging at 8 ± 0.5 °C and 90 ± 5% relative humidity for 14 days, allowing the researchers to compare postharvest quality and antioxidant measurements among treatments.

On day 14, tomatoes grown in raw tomato stalk waste had approximately 54% less weight loss than those grown in cocopeat. The raw-waste treatment also retained relatively high titratable acidity and had the highest measured vitamin C concentration, 206.5 mg kg−1 fresh weight, and ferric reducing antioxidant power, 35.82 mmol Trolox equivalents kg−1 fresh weight. Composted tomato stalk waste had the highest DPPH antioxidant activity. Cocopeat produced the firmest fruit and the highest soluble solids content, while peat plus perlite had the lowest respiration rate. Raw and composted tomato stalk waste maintained higher a* values than cocopeat, and all three media other than cocopeat had higher total phenolic and total flavonoid contents. Principal component analysis and hierarchical clustering identified treatment-associated patterns, while false-discovery-rate-adjusted correlations showed coordinated relationships among quality-preservation attributes.

The results indicate that the influence of the growing medium varied by measured trait rather than favoring one medium across every outcome. The authors identified raw tomato stalk waste as a possible alternative soilless medium for limiting selected postharvest quality losses, but the evidence comes from one tomato cultivar, one specified production system, four media and one 14-day storage regime. The article’s abstract calls for validation across additional cultivars and production conditions. The reported results therefore do not establish longer storage life, broad effects across tomato varieties or a single mechanism explaining the differences among treatments.

Subject of Research: Effects of tomato stalk waste-based growing media on selected postharvest quality and antioxidant measures in cold-stored tomatoes

Article Title: Effects of tomato stalk waste–based growing media on postharvest quality and antioxidant capacity of tomato fruit during cold storage

Article References: Yoruk, E., Ozer, H., Ozer, M. O., Ates, U., & Ozturk, B. (2026). Effects of tomato stalk waste–based growing media on postharvest quality and antioxidant capacity of tomato fruit during cold storage. BMC Plant Biology. https://doi.org/10.1186/s12870-026-09999-1

Image Credits: AI Generated

DOI: 10.1186/s12870-026-09999-1

Keywords: tomato, tomato stalk waste, soilless cultivation, growing media, postharvest quality, cold storage, antioxidant capacity, vitamin C, FRAP, DPPH, Effects, stalk

The breeding logic behind the study rests on a well-established principle in modern horticulture: the rootstock controls the root system and much of the plant’s interaction with the soil, while the scion determines the fruit. By combining the fruit quality of a commercial cultivar with the defensive arsenal of a wild species below ground, breeders can protect a crop without altering what the consumer eats. Solanum habrochaites, native to the Peruvian and Ecuadorian Andes, carries resistance alleles against a suite of devastating soilborne and vascular diseases, including Fusarium wilt, Fusarium crown and root rot, Verticillium wilt, and root-knot nematodes. Interspecific hybridization between the two species allows those resistance alleles to be captured in hybrid rootstock lines while retaining the graft compatibility that comes from the cultivated tomato genome.

From an initial pool of fifteen hybrid combinations developed under the TÜBİTAK project, the team selected six candidates, designated RSH-6, RSH-16, RSH-17, RSH-18, and two additional lines, for detailed evaluation. Each was compared with the commercial rootstocks Beaufort F1, Arazi F1, and Balance F1, widely used in greenhouse tomato production. The scion in every combination was Fulya F1, a commercial Turkish greenhouse cultivar, and an ungrafted Fulya F1 control was included to isolate the rootstock effect. All plants were propagated by tube grafting, a technique that joins scion and rootstock segments in small plastic tubes until the vascular tissues fuse, and then grown through a full spring greenhouse cycle where graft success, yield, and fruit quality could be measured under realistic production conditions.

The molecular component of the study used DNA markers linked to known resistance genes to determine which defensive alleles each rootstock carried. Marker-assisted selection of this kind allows breeders to identify resistance without waiting for pathogen challenge tests, which are slow, expensive, and dependent on seasonal conditions. The analysis revealed that all six candidates carried resistance-associated alleles for Fusarium wilt, Fusarium crown and root rot, Verticillium wilt, and root-knot nematode resistance, but four lines stood out. RSH-6, RSH-16, RSH-17, and RSH-18 carried the most complete set of resistance-associated alleles across the four disease targets, a breadth of coverage that few commercial rootstocks can match as soilborne pathogens continue to evolve and erode established resistances.

Graft success, the proportion of grafted plants that survive and grow normally, ranged from 93.33 percent to 100.00 percent across the interspecific candidates, figures that place them squarely within the range expected of commercial rootstocks. Graft compatibility is a critical practical filter in rootstock breeding, because a rootstock that carries superb resistance genes is worthless if it cannot form a functional vascular connection with the scion. The high success rates observed here suggest that the interspecific hybrids, despite their wild parentage, have retained the anatomical and physiological compatibility needed for commercial propagation, a result the authors attribute to the careful selection of hybrid combinations during the earlier breeding phases.

Yield performance told a more nuanced story. Total yield per plant differed significantly among the rootstock-scion combinations, ranging from 4.70 to 6.46 kilograms per plant, with a statistical significance threshold of p less than 0.05. The top performer was RSH-6, which achieved the highest total yield in the trial and was statistically comparable to the commercial rootstocks Beaufort F1, Arazi F1, and Balance F1. This result matters because it demonstrates that a newly developed interspecific hybrid, carrying a broader set of resistance alleles than the commercial standards, can match them in raw productivity during a spring greenhouse cycle. The remaining candidates showed varying yield levels, some of which fell below the commercial range, indicating that not every resistance-rich hybrid translates into horticultural excellence.

Fruit quality measurements added a further layer of evaluation. Several of the grafted combinations produced fruit with greater width and firmness than the ungrafted Fulya F1 control, suggesting that the rootstocks were not merely supporting the scion but actively enhancing certain physical fruit traits. Fruit firmness in particular is a commercially valuable attribute, affecting shelf life, transport tolerance, and consumer perception. Other quality traits were largely comparable among treatments, indicating that grafting onto the interspecific rootstocks did not compromise the essential eating quality of the scion cultivar. The absence of significant negative effects on fruit quality is a key finding, because rootstocks with wild parentage sometimes introduce off-flavors or altered fruit morphology that render them commercially unacceptable.

To integrate the molecular, yield, and quality data into a single performance picture, the team applied multivariate statistical analyses, including principal component analysis, to the full dataset. These methods reduce many correlated traits into a smaller number of independent axes of variation, allowing researchers to visualize which rootstock-scion combinations cluster together and which stand apart. The analyses placed RSH-6 close to the commercial standards and supported its favorable overall profile of yield and fruit quality, confirming that the experimental candidate performs on par with established rootstocks while carrying a more complete set of resistance-associated alleles. The multivariate framework also highlighted the trade-offs among the remaining candidates, some of which excelled in individual traits but fell short in overall balance.

The authors conclude that several of the newly developed interspecific hybrid rootstocks combine a broad set of resistance-associated alleles with high graft success and satisfactory horticultural performance, and they single out RSH-6 as the most promising candidate overall. Its yield and fruit-quality characteristics were comparable to established commercial rootstocks, while its molecular profile suggested superior defensive coverage against the major soilborne and vascular diseases of tomato. The team recommends that RSH-6 proceed to multi-location and multi-season validation trials, the standard next step before a new rootstock can be released commercially. Such trials will test whether the performance observed in a single spring greenhouse cycle holds across different environments, seasons, and pathogen pressures, and whether the resistance alleles identified by molecular markers translate into durable field-level protection.

The broader significance of the work lies in its demonstration of a complete breeding pipeline, from wild-species hybridization through molecular marker screening to greenhouse evaluation of agronomic performance. As climate change and evolving pathogens place increasing pressure on global tomato production, which depends on a narrow genetic base for its defensive genes, the ability to rapidly develop and validate new rootstocks carrying diverse resistance alleles becomes a strategic asset. The study also illustrates the value of public-private collaboration, combining academic expertise at Ondokuz Mayıs University with the commercial breeding capacity of Genetika Seeds under TÜBİTAK funding. If RSH-6 and its sibling candidates pass the upcoming validation trials, growers may soon have access to rootstocks that offer both the disease resistance needed for sustainable production and the yield and fruit quality demanded by modern markets, reducing the industry’s dependence on a handful of aging commercial cultivars whose immunity is steadily being compromised.

Subject of Research: Evaluation of promising interspecific tomato rootstocks (Solanum lycopersicum × Solanum habrochaites) for molecular marker-based resistance screening, yield, and fruit quality

Article Title: Evaluation of promising interspecific tomato rootstocks (Solanum lycopersicum × Solanum habrochaites) for molecular marker-based resistance screening, yield, and fruit quality

Article References: Yücel, H. Ş., & Seçim, A. (2026). Evaluation of promising interspecific tomato rootstocks (Solanum lycopersicum × Solanum habrochaites) for molecular marker-based resistance screening, yield, and fruit quality. BMC Plant Biology. https://doi.org/10.1186/s12870-026-10192-7

Image Credits: AI Generated

DOI: 10.1186/s12870-026-10192-7

Keywords: tomato rootstocks, Solanum habrochaites, grafting, disease resistance, molecular markers, plant breeding, BMC Plant Biology, Evaluation, promising, interspecific, tomato, rootstocks

Protein hydrolysates are mixtures of free amino acids and short peptides produced by breaking down protein-rich raw materials, either chemically or with enzymes. In plant science they belong to a fast-growing class of products known as biostimulants: substances that, applied in small quantities, enhance crop performance without acting as conventional fertilizers, pesticides, or growth regulators. The mechanisms are thought to include a signaling role for specific amino acids, stimulation of root development, improved nutrient uptake, and priming of the plant’s antioxidant machinery. What distinguishes the new work is the raw material, fish waste from aquaculture, and the production route, enzymatic hydrolysis, which is gentler than acid hydrolysis and better at preserving bioactive peptides.

The research team prepared the hydrolysate from rainbow trout (Oncorhynchus mykiss) by-products using an enzymatic method and then tested it on tomatoes cultivated in a soilless greenhouse system. Soilless, or hydroponic, cultivation is prized for its water efficiency and precise control of the root zone, but it also deprives plants of the complex microbial and organic chemistry of living soil. Growers therefore compensate with carefully balanced nutrient solutions, and biostimulants have emerged as a possible third lever. The researchers applied the hydrolysate in two ways, to the roots and to the leaves, at four concentrations: zero as a control, 0.2 grams per liter, 0.4 grams per liter, and 0.8 grams per liter.

The dose mattered, and the pattern that emerged was far from a simple more-is-better relationship. Plants receiving the 0.2 grams per liter treatment posted the strongest photosynthetic performance, with a photosynthesis rate of 39.3 micromoles per square meter per second and stomatal conductance of 797.2 millimoles per square meter per second, alongside the highest chlorophyll content index and the greatest accumulation of mineral nutrients in plant tissue. Moderate stomatal opening with high chlorophyll is exactly the profile a grower wants: the leaves are pulling in carbon dioxide efficiently while retaining water, converting light into sugars at close to peak capacity.

At the 0.4 grams per liter dose, the plants’ stress physiology told a subtler story. Leaves showed the highest values for the antioxidant enzyme ascorbate peroxidase, at 50.4 millimoles, and for malondialdehyde, a marker of oxidative damage to cell membranes, at 0.010 nanomoles per gram, together with a proline concentration of 0.21 milligrams per gram. Proline is an osmoprotectant that cells accumulate under pressure, while malondialdehyde indicates lipid peroxidation, so its elevation suggests that this dose pushed the plants mildly out of their comfort zone even as it triggered a stronger defensive response. The antioxidant enzyme ascorbate peroxidase converts hydrogen peroxide, a reactive oxygen species, into water, and its induction is a classic sign of biostimulant priming, in which a mild challenge leaves the plant better prepared for stress.

The strongest yield and quality gains appeared at the highest dose tested. Plants treated with 0.8 grams per liter produced the heaviest average fruit weight, 114.3 grams per fruit, along with the highest leaf catalase activity, 0.71 units per gram per minute, and the highest lycopene value recorded in the trial, 34.4. Lycopene is the red carotenoid pigment prized both for its contribution to tomato color and for its documented health benefits as a dietary antioxidant, so elevating it is commercially and nutritionally significant. The authors concluded that yield and profitability were increased with hydrolysate doses of 0.4 and 0.2 grams per liter respectively, indicating that the economically optimal dose depends on whether a grower prioritizes total output or input efficiency.

Not every quality parameter moved in the same direction. The highest soluble solids content, 3.98 percent, and the highest anthocyanin concentration, 0.19 grams of cyanidin-3-glucoside equivalents per kilogram, were both found in the untreated control plants. This is a recurring phenomenon in horticulture: when plants are well supplied with water and nutrients, sugars and pigments get diluted in larger fruits, whereas slight stress concentrates flavor compounds. For growers the finding implies a genuine trade-off between size and taste chemistry, one that a carefully chosen dose of biostimulant may help navigate rather than eliminate.

The study’s framing of foliar application as a supporter of physiological homeostasis deserves attention. The authors suggest that spraying the hydrolysate onto leaves helps the plant maintain its internal balance under standard greenhouse conditions, essentially acting as a biochemical stabilizer rather than a dramatic growth driver. In a soilless system, where the root environment is already precisely controlled, foliar feeding of amino acids and peptides may smooth out the small daily fluctuations in water status and nutrient supply that plants would otherwise buffer themselves. This positions protein hydrolysates less as miracle inputs and more as a fine-tuning tool for high-technology growing systems.

The broader significance lies in the circular economy logic of the approach. Aquaculture is one of the fastest growing food industries in the world, and fish processing generates large volumes of protein-rich waste, including heads, skin, bones, and viscera, that often becomes low-value feed or landfill. Enzymatic hydrolysis converts this material into a product with clear agricultural value, closing a loop between marine food production and protected horticulture. Compared with synthetic plant growth regulators, hydrolysates are perceived as more sustainable and more acceptable to consumers, and compared with mineral fertilizers they require far smaller application rates because they work through biological signaling rather than bulk nutrient supply.

There are caveats, as with any single-crop, single-season greenhouse trial. The results were obtained in one soilless system with one hydrolysate preparation, and the interplay between application method, dose, and outcome is complex enough that recommendations for commercial growers will need replication across seasons, cultivars, and growing conditions. The biochemical markers measured, from malondialdehyde to catalase, indicate that the doses used were not physiologically inert and that the highest dose imposed some oxidative signaling. Still, the study provides a quantified, dose-resolved picture of how a waste-derived biostimulant moves the needle on tomato photosynthesis, fruit weight, and pigment content. As growers worldwide face pressure to cut synthetic inputs while raising yields on shrinking land and water budgets, the idea that tomorrow’s tomatoes could be fattened, in part, by yesterday’s fish fillets is exactly the kind of practical, evidence-based circularity that sustainable agriculture has been searching for.

Subject of Research: Use of fish-waste-derived protein hydrolysate as a biostimulant to improve tomato growth and productivity in soilless cultivation

Article Title: Utilization of protein hydrolysates to enhance growth and productivity of tomato under soilless cultivation systems

Article References: Tütüncü, A. Ç., Özer, H., Korkmaz, K., Hazneci, E., Öztürk, B., & Gülser, C. (2026). Utilization of protein hydrolysates to enhance growth and productivity of tomato under soilless cultivation systems. BMC Plant Biology. https://doi.org/10.1186/s12870-026-09959-9

Image Credits: AI Generated

DOI: 10.1186/s12870-026-09959-9

Keywords: protein hydrolysate, biostimulant, soilless cultivation, tomato, rainbow trout, circular economy, foliar application, lycopene, antioxidant enzymes, greenhouse horticulture, aquaculture waste, plant physiology

The economic stakes are enormous. Reported yield losses in tomato and cucurbit crops range from 80 to 100 percent depending on the growth stage at infection, the host genotype, and the severity of the epidemic. The virus now infects more than 40 plant species across several families, including Solanaceae, Cucurbitaceae, Fabaceae, Malvaceae, Euphorbiaceae, and Papaveraceae. Its arrival in Spain in 2012 marked a major epidemiological shift, as it rapidly adapted to cucurbit crops such as zucchini and melon and then spread throughout the Mediterranean to Italy, Tunisia, Morocco, Greece, Algeria, France, and Portugal. Wild and weed species, including Datura stramonium, Solanum nigrum, and Sonchus oleraceus, serve as reservoirs that keep viral inoculum alive between growing seasons and seed new outbreaks.

At the molecular level, ToLCNDV carries a bipartite circular single-stranded DNA genome composed of two molecules, DNA-A and DNA-B, each roughly 2.7 to 2.8 kilobases long. DNA-A encodes the replication-associated protein Rep/AC1, the transcriptional activator protein TrAP/AC2, the replication enhancer protein REn/AC3, the coat protein CP/AV1, and the AC4 protein. DNA-B encodes the nuclear shuttle protein NSP/BV1, which ferries viral DNA between the nucleus and cytoplasm, and the movement protein MP/BC1, which enables cell-to-cell passage through plasmodesmata. This compact, overlapping genome organization allows the virus to hijack host cell resources with remarkable efficiency, including cell cycle regulation and antiviral defense responses. Notably, in the presence of a DNA β satellite, the DNA-A component can act in a monopartite-like manner, with the satellite-encoded βC1 protein complementing the movement functions normally provided by DNA-B.

The virus population itself is far from homogeneous. Asian isolates cluster in a group designated ToLCNDV-OM, the Oriental melon strain, with approximately 94 percent DNA-A sequence identity among them. Isolates from the western Mediterranean Basin form a distinct and highly homogeneous group, ToLCNDV-ES, the Spain strain, sharing more than 99 percent identity among themselves but less than 94 percent with other global isolates. Isolates from India and Pakistan show further divergence, and current data suggest the ToLCNDV population comprises at least seven genetically distinct strains. Comparative transcriptomic studies indicate that Indian isolates induce stronger host transcriptional reprogramming and more severe disease responses than ToLCNDV-ES isolates in cucumber, hinting at strain-specific differences in virulence and resistance-breaking potential, though definitive evidence for strain-specific resistance breakdown remains limited.

Transmission biology adds another layer of complexity. Viruliferous whiteflies acquire viral particles through their stylets within 10 to 60 minutes of feeding on phloem tissues. After a latent period inside the vector, typically 8 to 19 hours depending on virus and vector species, the virus follows a circulative path from the midgut epithelium into the hemolymph and finally to the salivary glands, where it is injected into a new host during subsequent feeding. Experimental studies have also detected seed and pollen transmission, with high transmission rates of 60 percent to seedlings reported in zucchini, raising phytosanitary concerns about seed movement, although another report suggests seed transmission is unlikely to impact natural field conditions significantly.

Host resistance remains the most cost-effective and environmentally friendly approach to managing begomovirus-induced leaf curl disease. In tomato, the dominant Ty gene family, derived primarily from wild Solanum species such as S. chilense, S. peruvianum, S. habrochaites, and S. pimpinellifolium, provides the primary source of resistance. Ty-1 and Ty-3 encode DFDGD-class RNA-dependent RNA polymerases that enhance RNA-directed DNA methylation and transcriptional gene silencing, thereby inhibiting viral replication through increased cytosine methylation of viral genomes. Ty-2, by contrast, functions through nucleotide-binding leucine-rich repeat-mediated immune reactions. The recessive allele ty-5 corresponds to a mutation in the pelota gene, which affects translation and viral replication efficiency. In cucurbits, resistance is typically polygenic and quantitative. The recently identified Cy-1 locus on cucumber chromosome 1 encodes CsRDR3, a DFDGD-class RNA-dependent RNA polymerase functionally homologous to Ty-1 and Ty-3 in tomato, and functional silencing of CsRDR3 severely compromises resistance, confirming its antiviral role. Melon resistance is associated with major quantitative trait loci on chromosomes 11, 2, and 12, while pumpkin resistance loci on chromosomes 7 and 8 show molecular marker prediction accuracies approaching 94 percent.

Yet the virus has evolved sophisticated counter-defenses. Several ToLCNDV-encoded proteins, including AV2, AC2, AC4, and the satellite-associated βC1, function as viral suppressors of RNA silencing. AC2 is a central regulator that suppresses both post-transcriptional and transcriptional gene silencing, obstructing components of the DNA methylation pathway such as ARGONAUTE 4 and interfering with AGO1-mediated RISC activity. AC4 binds small RNAs and prevents their integration into the RISC complex, while AV2 interferes with RDR1-mediated antiviral siRNA amplification. The virus also manipulates host transcription and hormone networks, particularly jasmonic acid and ethylene signaling, compromising plant immunity. Variations in a 63-nucleotide region of the C-terminal domain of TrAP and REn alter interactions with host proteins such as PCNA and AGO1, regulating infection efficiency and facilitating host range changes. Interactions with betasatellites significantly increase viral DNA accumulation and accelerate disease development, with viral titers correlating more strongly with betasatellite abundance than with the helper virus itself, while alphasatellites operate more subtly, often attenuating symptoms and reducing betasatellite accumulation through competitive dynamics within the virus-satellite complex.

Emerging technologies offer new hope for durable control. CRISPR/Cas systems can be designed to target conserved viral sequences essential for replication or pathogenicity. Early demonstrations in transgenic Nicotiana benthamiana and Arabidopsis thaliana expressing Cas9 with guide RNAs targeting viral intergenic regions, coat protein genes, or Rep genes showed marked reductions in viral accumulation and symptom severity. A recent study targeting Chilli leaf curl virus in Nicotiana benthamiana found that dual-guide constructs consistently outperformed single-guide systems, with the most effective combination reducing viral titer by 49.3 percent at 4 days post-inoculation and 47.9 percent at 20 days post-inoculation. Cas12a, which generates staggered cuts and processes multiplex guide arrays more efficiently than Cas9, presents another promising avenue. Beyond direct viral targeting, editing host susceptibility genes implicated in replication or intracellular trafficking may offer recessive, broad-spectrum resistance. RNA silencing-based strategies, including host-induced gene silencing and spray-induced gene silencing with exogenous double-stranded RNA molecules targeting viral genes such as Rep or AC2, have lowered viral titers by 40 to 80 percent in related plant-virus systems, offering a non-transgenic crop protection approach.

Despite these advances, sustainable management remains challenging due to the rapid evolution of the virus and the adaptability of its vector. Strong selection pressure from resistant cultivars can drive the emergence of resistance-breaking viral types, and relying on host resistance alone may not provide long-term defense. The whitefly B. tabaci is itself a cryptic species complex, with different members varying in transmission efficiency, insecticide resistance, fecundity, and climatic adaptability, complicating regional disease forecasting. Climate change adds further complexity, as milder winters, increased protected horticulture, and temperature fluctuations favor whitefly population growth and prolong transmission periods, likely promoting earlier seasonal outbreaks and expansion into historically unsuitable regions.

The future of ToLCNDV management, the review concludes, will rest on integrated approaches combining resistant cultivars, certified clean seed, rapid molecular diagnostics such as PCR and LAMP assays, judicious whitefly control, management of alternate weed hosts, crop sanitation, and coordinated area-wide surveillance. Multi-omics integration, spanning genomics, transcriptomics, proteomics, metabolomics, epigenomics, and small RNA sequencing, can generate systems-level models of susceptibility and resistance, while single-cell and spatial transcriptomics may reveal tissue-specific defense niches in phloem-associated cells where begomoviruses replicate and move. Artificial intelligence and machine learning tools are emerging for outbreak prediction, symptom recognition, and accelerated breeding decisions. Translating molecular discoveries into successful field control will require sustained commitment, continuous vigilance, and a systems-level understanding of the host-virus-vector relationship under changing climatic and agricultural conditions.

Subject of Research: Virology

Article Title: Host resistance and susceptibility to tomato leaf curl New Delhi virus: molecular mechanisms, genetic resources, and strategies for durable control

Article References: Phogat, S., Shukla, G., Singh, A., Singhal, P., Singh, J., & Baranwal, V. K. (2026). Host resistance and susceptibility to tomato leaf curl New Delhi virus: molecular mechanisms, genetic resources, and strategies for durable control. Frontiers in Virology, 6, Article 1869978. https://doi.org/10.3389/fviro.2026.1869978

Image Credits: AI Generated

DOI: 10.3389/fviro.2026.1869978

Keywords: ToLCNDV, begomovirus, plant virology, host resistance, CRISPR, whitefly, RNA silencing, durable disease control, Host, resistance, susceptibility, tomato

Daniela Lorena Lamas of the Instituto de Investigaciones Marinas y Costeras in Mar del Plata, Argentina, examined recent advances in both technologies through what she calls a multiscale framework, connecting molecular and cellular events to the macroscopic properties that actually matter in a factory: texture, mass transfer, extraction efficiency, and the recovery of valuable bioactive compounds such as lycopene. Her central insight is deceptively simple. Although ultrasound and pulsed electric fields can both improve extraction and processing, they attack the tomato through fundamentally different structural targets, and understanding those differences is the key to designing better, more sustainable tomato products.

Ultrasound works through acoustic cavitation. When high-intensity sound waves, typically in the range of 20 to 100 kilohertz, pass through the water-rich tissue of a tomato, they generate microscopic bubbles that grow and then collapse violently. The implosion of each bubble produces localised shear forces, microjets travelling at speeds between 200 and 700 metres per second, and transient spikes in temperature and pressure. These phenomena physically rupture cell walls, tear apart middle lamella structures that hold cells together, and progressively erode tissue architecture. The result is a cascade of structural damage that propagates upward through the hierarchy of the tomato matrix, from molecular liberation of bound compounds to cellular membrane poration to tissue-scale particle fragmentation, ultimately reducing mass transfer resistance and accelerating the release of intracellular metabolites.

Pulsed electric fields, by contrast, take a surgical approach. Short bursts of high-voltage electricity, typically between 0.5 and 10 kilovolts per centimetre at moderate intensities, induce a phenomenon called electroporation. When the electric field generates a transmembrane potential across a cell membrane that exceeds a critical threshold, the phospholipid bilayer rearranges and forms nanoscale pores. The membrane becomes permeable, allowing solvents and solutes to pass freely, but the surrounding cell wall network remains largely intact. This selectivity is what makes pulsed electric fields so attractive for tomato processing. The technology can soften tissue, reduce peeling resistance, and enhance the extraction of lipophilic carotenoids without the indiscriminate thermal damage that conventional heat treatment causes.

The quantitative gains reported in the literature are striking. Optimised ultrasound-assisted extraction protocols can increase carotenoid and lycopene recovery from tomato processing residues by 40 to 50 percent while halving extraction times, and when combined with tailored encapsulation strategies the recovered compounds maintain superior stability. Pulsed electric field treatments have been shown to increase lycopene extraction from tomato waste by up to 47 percent, rising from 9.84 to 14.31 milligrams per 100 grams, while enhancing the recovery of β-carotene and β-cryptoxanthin by up to 69 and 24 percent respectively. In some studies, controlled membrane permeabilisation boosted lycopene extractability by as much as 88 percent. At the tissue level, pulsed electric field softening of the skin–parenchyma interface reduced the mechanical work required for industrial peeling by 72.3 percent while increasing juice yield by 20.5 percent.

But the review goes beyond extraction engineering. Lamas highlights emerging evidence that ultrasound can trigger complex physiological responses in living tomato tissues, not just processed ones. When applied to tomato seeds and seedlings, acoustic cavitation induces the formation of controlled reactive oxygen species, which act as cellular elicitors. These molecules upregulate the transcription of stress-responsive genes and activate antioxidant defence enzymes such as superoxide dismutase, catalase, and peroxidase. The downstream effect is a defensive biochemical shift that increases the concentration of free phenolics, ascorbic acid, and specific antioxidant fractions within the plant matrix. At the organismal level, this translates into enhanced germination rates, accelerated early seedling growth, and improved tolerance to subsequent environmental stresses such as drought.

The most provocative finding in the review concerns transgenerational plasticity. Emerging evidence suggests that ultrasound priming of tomato plants can induce epigenetic modifications that persist across subsequent plant progenies, altering drought-adaptive physiological responses in offspring that were never directly exposed to the acoustic treatment. If confirmed, this would shift ultrasound from a purely physicochemical engineering tool toward a potential modulator of biological signalling pathways, expanding the concept of structure–property relationships from dead industrial matrices to living biological systems where structural perturbations can regulate biochemical and physiological functions across generations.

Despite these advances, both technologies face significant engineering bottlenecks. Ultrasound reproducibility is highly sensitive to reactor geometry, acoustic energy attenuation, and processing configuration, complicating cross-study standardisation and pilot-scale translation. Pulsed electric field efficiency depends heavily on the electrical conductivity and physical homogeneity of the tomato matrix, making the technology well suited to pumpable purees and juices but challenging for irregular solid masses. The intrinsic biophysical properties of the tomato itself constrain both processes: tissue porosity dictates acoustic propagation, while electrical conductivity governs field uniformity. At high processing thresholds, excessive acoustic or electrical power inputs risk localised degradation of thermolabile molecules such as lycopene, and in the case of pulsed electric fields, high field intensities between 35 and 40 kilovolts per centimetre can generate localised Joule heating within the conductive tomato matrix, undermining the non-thermal nature of the process.

The analytical toolkit for monitoring these structural transitions is advancing rapidly. Scanning electron microscopy profiles surface erosion, confocal laser scanning microscopy assesses membrane integrity, and Fourier-transform infrared spectroscopy traces chemical alterations within the polysaccharide cell wall matrix. These complementary techniques provide valuable evidence of microstructural and chemical modifications, but Lamas notes that establishing quantitative structure–property relationships requires integrating these observations with complementary measurements of macroscopic properties, including rheological behaviour, texture, permeability, and mass transfer characteristics. Without that integration, the field risks accumulating descriptive data without predictive power.

The review closes with a call for predictive multiscale models that can couple cavitation physics, electroporation dynamics, and biological responses within a single framework. Such models would accelerate the design of continuous, large-scale non-thermal platforms within sustainable circular bioeconomies, where tomato waste is no longer a liability but a valuable secondary raw material rich in lycopene, phenolics, and dietary fibre. The sequential or combined integration of ultrasound and pulsed electric fields within a single cascade biorefinery layout remains an open research gap, but coupling cavitation-driven cell wall fragmentation with electroporation-mediated membrane permeabilisation offers a promising pathway for efficient, solvent-free process intensification. For an industry processing more than 130 million tonnes annually, the difference between treating tomato waste as landfill and treating it as a bioresource may come down to how precisely engineers can control the structural hierarchy of the fruit itself.

Subject of Research: Tomato processing

Article Title: Multiscale structural effects of ultrasound and pulsed electric field processing on structure–property relationships in tomato systems: a mini-review

Article References: Lamas, D. L. (2026). Multiscale structural effects of ultrasound and pulsed electric field processing on structure–property relationships in tomato systems: a mini-review. Frontiers in Soft Matter, 6, Article 1887216. https://doi.org/10.3389/frsfm.2026.1887216

Image Credits: AI Generated

DOI: 10.3389/frsfm.2026.1887216

Keywords: Multiscale, structural, effects, ultrasound, pulsed, electric, field, processing, structure, property, relationships, tomato

The research team, led by Prachand Neupane and colleagues, set out to test whether essential oils could replace conventional preservatives such as Bavistin and calcium chloride, which are widely used to extend postharvest life but carry residual toxicity concerns. Essential oils have attracted growing scientific interest because of their antioxidant, antifungal, and antibacterial properties, their low mammalian toxicity, and their biodegradability. Earlier in vitro work has shown that lemongrass oil at concentrations from 25 to 500 ppm suppresses colony formation by major tomato spoilage fungi, including Colletotrichum coccodes, Botrytis cinerea, Cladosporium herbarum, Rhizopus stolonifer, and Aspergillus niger.

The experiment used the Srijana tomato variety, a popular hybrid developed by Nepal’s Horticulture Research Division that farmers favor for its adaptability to off-season cultivation and its market appeal. Fruits were harvested at the light red stage from a farm in Harisiddhi, Lalitpur, in late November 2021 and transported to the Central Lab at Paklihawa. After cleaning, manual grading, and visual sorting to ensure uniform size, color, and quality, samples were placed in 2.8-liter plastic containers holding 21 tomatoes each.

Seven treatments were arranged in a completely randomized design with three replications. Four groups received lemongrass essential oil vapor at concentrations of 50, 100, 150, and 200 ppm, sealed under aluminum foil for eight hours. A fifth group was dipped in 1 percent calcium chloride solution and a sixth in a 100 percent extract of Justicia adhatoda, a medicinal plant known locally as Asuro, for 30 minutes each. The seventh group served as an untreated control. The lowest oil concentration was chosen to establish the minimum effective dose, while the highest was intended to reveal any toxic effects during storage.

Over 14 days, the researchers measured physical attributes—weight loss and firmness—and chemical attributes including pH, total soluble solids, titratable acidity, and vitamin C content, sampling every two days. Juice extracted from 20-gram slices was diluted and centrifuged at 10,000 rpm before analysis. Total soluble solids were read with a digital refractometer, acidity was determined by titration with 0.1 N sodium hydroxide, and vitamin C was quantified using the dichlorophenol-indophenol titration method. Statistical differences were evaluated with analysis of variance followed by Duncan’s Multiple Range Test at a significance threshold of p < 0.05.

Weight loss rose steadily in all groups as storage progressed, driven by transpiration, respiration, and dehydration, but the differences among treatments were not statistically significant. Maximum weight loss of 12.86 percent occurred in the Asuro extract treatment, possibly because compounds in the extract accelerate respiration, while the untreated control lost the least at 9.73 percent. Firmness told a different story: tomatoes treated with 100 percent Asuro extract retained the highest firmness, 5.71 Nmm⁻¹, on day 14, an effect the authors attribute to the antimicrobial activity of Justicia adhatoda. Firmness naturally declines as pectin breaks down into soluble forms and cell wall polysaccharides degrade, processes that moisture loss and enzymatic activity accelerate.

The chemical measurements revealed the clearest treatment effects. Total soluble solids climbed until day 10 as starch converted to sugars, then declined in nearly all treatments by days 12 and 14. The highest reading, 4.933 °Brix, appeared in the calcium chloride group, while the lowest, 3.466 °Brix, occurred at 200 ppm essential oil—a pattern consistent with delayed ripening, since slower carbohydrate conversion keeps soluble sugar accumulation in check. Titratable acidity fell continuously across the storage period as organic acids were consumed as respiratory substrates, dropping to a minimum of 0.21 percent at 200 ppm essential oil and holding highest at 0.36 percent in the Asuro treatment by day 14.

Vitamin C content increased through day 8 before declining, and the 200 ppm essential oil treatment preserved the highest level, 0.276 mgml⁻¹. The researchers suggest that higher concentrations of lemongrass oil limit oxygen exposure, inhibiting ascorbate activity and delaying oxidative degradation of the vitamin. The ratio of soluble solids to acidity, a key predictor of flavor palatability, differed significantly among treatments, peaking at 21.08 in the calcium chloride group and falling to 9.92 in the Asuro treatment at day 14, with the 200 ppm oil treatment close behind the leader at 17.12.

The study’s conclusion is that 200 ppm lemongrass essential oil delivered the best overall physicochemical performance, positioning essential oils as viable, non-hazardous alternatives to conventional chemical preservatives for tomato postharvest handling. The authors caution that the work was conducted on a single variety over a short period in a laboratory setting, and they recommend larger-scale trials across multiple varieties and concentrations before farmers adopt the practice. Cost is another hurdle: essential oils remain more expensive than synthetic chemicals, though the researchers suggest that blending them with organic acids could improve both efficacy and economics. For a country where most growers and traders have limited access to cold storage and proper postharvest facilities, a low-cost, plant-based vapor treatment could offer a practical way to cut losses in a crop that sits at the heart of both rural livelihoods and national diets.

Subject of Research: Postharvest preservation of tomatoes using lemongrass essential oil

Article Title: Effect of essential oil on shelf-life and quality attributes of tomato in Rupandehi, Nepal

Article References: Neupane, P., Poudel, B., Wosti, B., Pandey, S., Chaudhary, M., G. C., A., Khanal, R. P., & Chaurasia, J. (2025). Effect of essential oil on shelf-life and quality attributes of tomato in Rupandehi, Nepal. Innovations in Agriculture, 8, 1-10. https://doi.org/10.3897/ia.2025.142908

Image Credits: AI Generated

DOI: 10.3897/ia.2025.142908

Keywords: tomato, lemongrass essential oil, postharvest, shelf life, Nepal, Justicia adhatoda, vitamin C, titratable acidity, total soluble solids, food preservation, calcium chloride, agriculture

The research team, led by Maha Elbana of Beni-Suef University in Egypt, alongside collaborators from the China Meteorological Administration, the National Authority for Remote Sensing and Space Sciences, and the International Center for Agricultural Research in the Dry Areas, conducted their experiment at the Arid Lands Agricultural Studies and Research Institute of Ain Shams University. Their goal was ambitious: to simultaneously track water use, energy demand, nitrogen efficiency, fruit quality, and crop yield under conditions where a shallow water table sits close enough to the root zone to buffer the soil’s moisture supply.

The experimental setup was carefully controlled. Tomato plants of the variety Rich Zoan K186 were grown in clay loam soil—composed of 34.4 percent clay, 35.9 percent silt, and 29.7 percent sand—across two growing seasons: Spring 2023 and Autumn 2023-2024. A pressurized drip irrigation system, governed by daily soil-moisture readings from time-domain reflectometry probes, ensured that every plot received water only when root-zone moisture dropped to 50 percent of available water. This uniform irrigation protocol meant that differences among treatments could not be attributed to water stress; instead, the researchers manipulated two factors: nitrogen rate and biochar application.

Six treatment combinations were tested. Three nitrogen rates—431, 345, and 215 kilograms of nitrogen per hectare, corresponding to 100, 80, and 50 percent of the local farmer practice—were crossed with two biochar levels: zero or 35 tonnes per hectare. The biochar, derived from corn cobs, was incorporated into the top 30 centimeters of soil one week before transplanting. Each plot was hydraulically isolated with trenches to minimize lateral water movement, and the experiment was arranged in a randomized complete block design with three replicates.

The most striking result was what did not happen. Marketable fresh yield showed no statistically significant differences among any of the six treatment combinations, ranging from 81.4 to 108.6 tonnes per hectare in pooled treatment means. In a hydrologically buffered system—where shallow groundwater and high soil-water storage in fine-textured soil maintain root-zone moisture near a defined threshold—the crop simply did not respond to changes in nitrogen input with the yield differences that conventional agronomy might predict. The researchers’ null hypothesis for yield was not rejected.

But water productivity told a more nuanced story. A significant Season × Nitrogen-rate interaction emerged (F2,8.52 = 5.50, p = 0.029), indicating that the response of water productivity to nitrogen input varied between the two growing seasons. However, when the researchers applied Tukey-adjusted pairwise comparisons within each season, no individual nitrogen rate proved statistically superior to another. The pattern suggests that seasonal environmental conditions—temperature, radiation, evaporative demand—modulated how efficiently the crop converted water into yield under different nitrogen regimes, but not in a way that consistently favored one rate over another.

The energy accounting revealed the experiment’s most consequential finding. Fertilizer-associated nitrogen energy—calculated using an embodied energy coefficient of 60.6 megajoules per kilogram of nitrogen, reflecting the intensive industrial process of mineral nitrogen production—dominated the total accounted energy budget. At the full nitrogen rate, fertilizer-associated energy reached 26,143 megajoules per hectare, compared with just 1,270 to 1,831 megajoules per hectare for irrigation pumping. In other words, the energy embedded in nitrogen fertilizer was roughly 7 to 20 times greater than the energy required to pump irrigation water. Cutting nitrogen to 80 percent reduced fertilizer-associated energy by approximately 20 percent; cutting it to 50 percent reduced it by half.

Total accounted energy—combining irrigation pumping and fertilizer-associated nitrogen energy—ranged from approximately 14,430 megajoules per hectare under the 50 percent nitrogen treatments to over 27,500 megajoules per hectare under the full rate. Because irrigation energy remained statistically unchanged across treatments (p > 0.146), the nitrogen rate was the primary determinant of the overall energy footprint. This finding carries significant implications for arid-region agriculture, where mineral nitrogen production represents a substantial share of greenhouse gas emissions and where reducing unnecessary fertilizer inputs simultaneously addresses soil acidification, nitrate leaching, and climate burdens.

The integrated performance profiles, visualized through directionally normalized radar plots and standardized heatmaps, exposed trade-offs that yield alone could never reveal. Treatment W8—no biochar, 80 percent nitrogen—produced the highest pooled numerical yield at 108,583 kilograms per hectare while reducing fertilizer-associated energy by roughly 20 percent compared with the full rate. Meanwhile, treatment B5—biochar, 50 percent nitrogen—achieved the highest pooled water productivity at 39.59 kilograms per cubic meter, the highest energy productivity at 6.87 kilograms per megajoule, and a partial factor productivity of nitrogen of 459.09 kilograms of yield per kilogram of nitrogen applied. These ratio-based indicators, the researchers caution, increase partly because of smaller denominators and should not be interpreted as proof of agronomic superiority on their own.

Fruit quality responses were governed primarily by season rather than by management. Fruit acidity, nitrogen concentration, hardness, and nitrate-nitrogen levels all showed significant seasonal effects, while biochar and nitrogen-rate effects were restricted to specific variables and treatment contexts. The only statistically significant adjusted pairwise difference among nitrogen rates occurred for fruit acidity in spring under biochar, where the full nitrogen rate produced higher acidity than the 80 percent rate. Reducing nitrogen input did not produce a generalized deterioration in fruit quality, supporting the notion that moderate nitrogen reduction can maintain both yield and fruit composition under well-managed drip irrigation.

The broader implications extend beyond a single field in Egypt. The study demonstrates that in hydrologically buffered systems—where shallow groundwater, fine soil texture, and sensor-based irrigation conspire to equalize water availability across treatments—yield becomes a blunt instrument for evaluating management performance. Integrated indicators of water productivity, energy productivity, and nitrogen-use efficiency reveal contrasts that yield conceals. The researchers emphasize that their energy accounting represents a partial operational boundary, excluding biochar production, irrigation infrastructure, and post-harvest operations, and that future work should quantify nitrogen uptake, expand the life-cycle boundary, and test whether these trade-offs persist across different soil textures and longer timeframes. For now, the message is clear: two fields that look identical by the harvest scale may be worlds apart in the energy they consume and the resources they demand.

Subject of Research: Integrated water, energy, and nitrogen performance of drip-irrigated tomato production under varying nitrogen rates and biochar application in shallow groundwater conditions

Article Title: Integrated water–energy–nitrogen performance under nitrogen and biochar treatments in shallow groundwater tomato production

Article References: Elbana, M., Wang, L., El-Shirbeny, M. A., Gamal, R., Nangia, V., & Abou Hadid, A. F. (2026). Integrated water–energy–nitrogen performance under nitrogen and biochar treatments in shallow groundwater tomato production. Frontiers in Agronomy, 8, Article 1922454. https://doi.org/10.3389/fagro.2026.1922454

Image Credits: AI Generated

DOI: 10.3389/fagro.2026.1922454

Keywords: tomato, nitrogen fertilizer, biochar, drip irrigation, water productivity, energy productivity, shallow groundwater, arid agriculture, soil moisture, fertilizer energy, Egypt, sustainable farming

The distinction between pre-attachment and post-attachment resistance is central to interpreting the study’s results. Pre-attachment mechanisms operate before the parasite has established any vascular connection with the host, meaning that a failure at this stage prevents infestation altogether. The observation that only about one in five Cuscuta campestris seedlings managed to form haustoria on tomato stems points to a remarkably effective barrier operating at this earliest phase. By comparison, dodder seedlings attaching to many susceptible hosts establish connections with far greater frequency, which underscores how unusual the tomato stem surface must be from the parasite’s perspective.

The physical explanation proposed by the researchers is elegant in its simplicity. Dodder seedlings coil around a host stem and press specialized organs called haustoria against the host epidermis in an attempt to penetrate and eventually tap into the vascular tissue. For this pressure to be effective, the parasite must achieve close, stable contact with the epidermal surface. Long, non-glandular trichomes of types I and II act like a dense bristling forest that keeps the coiling parasite at arm’s length, so to speak, preventing the haustorial tips from seating firmly against the epidermis. Without firm contact, the mechanical stimulus and chemical cues that normally trigger haustorium differentiation are insufficient, and the seedling exhausts its limited reserves.

This exhaustion is a critical point. A germinated dodder seed contains only a small store of nutrients and must reach a host and establish a functional connection within days, or it dies. Any delay imposed by a physical barrier translates directly into reduced survival. The approximately eighty percent failure rate observed on tomato stems therefore represents not merely an inconvenience for the parasite but a lethal bottleneck in its life cycle. From an evolutionary standpoint, this suggests that trichome density on stems could be a trait under selection in natural populations where dodder pressure is significant, and conversely a trait that may have been inadvertently altered during tomato domestication and breeding.

The finding that the same long trichomes also impede secondary parasitism extends the significance of the results. Secondary parasitism, in which lateral branches from an already infested neighboring plant launch new attacks, is often the more destructive mode of spread in agricultural settings because a single established dodder plant can generate many aggressive stems simultaneously. If the trichome barrier bends under the pressure of a dodder stem but still prevents haustorial penetration, it provides protection not just against initial colonization but against the epidemic spread of the parasite through a crop or plant community. This dual function at both stages of parasitism strengthens the case that trichomes are a genuine resistance mechanism rather than an incidental observation.

Equally noteworthy is the behavior of the type VI glandular trichomes during infestation. These short, four-lobed structures are among the best-studied defensive features of tomato, known for storing acylsugars, terpenes, and phenolic compounds in an intercellular cavity that ruptures readily upon contact. The study’s observation that glandular heads near the parasite turned brown, showed strong autofluorescence, and sometimes ruptured is consistent with a controlled release of defensive chemistry at precisely the location where the parasite is attempting to establish itself. Autofluorescence in plant tissues is commonly associated with phenolic compounds and cell wall fortification, so the signal suggests both chemical discharge and localized defensive activation.

The second type VI response is perhaps even more intriguing. As the host constructed an epidermal and subepidermal defensive barrier beneath the site of attempted penetration, additional type VI trichomes darkened, lost turgor, and adopted a flattened four-lobed appearance. This coordinated change implies that glandular trichomes are not passive bystanders but active participants in a spatially organized defense program. The flattening and turgor loss may represent a programmed collapse that deposits stored metabolites onto the emerging barrier tissue, or it may reflect redirection of resources from secretion to structural support. Either interpretation positions type VI trichomes as sensors and effectors in the plant’s response to parasitic attack.

It is worth placing these observations in the broader context of trichome biology in the Solanaceae. Within the genus Solanum, trichome density and type vary enormously among species, and even among cultivated tomato varieties. Wild relatives of tomato, such as Solanum habrochaites and Solanum pennellii, are famous for their dense glandular covering and the potent insect-repellent chemistry it produces. Breeders have occasionally introgressed trichome-related traits from wild germplasm into cultivated lines for pest resistance. The present results suggest that stem trichome characteristics, which are usually evaluated with insects in mind, could also be relevant selection criteria for dodder resistance, opening a new avenue for breeding programs in tomato and potentially other crops.

The mechanism proposed here also invites comparison with well-documented trichome effects against other plant adversaries. Against small herbivorous insects, trichomes function partly by preventing the pest from achieving firm footing and close contact with the epidermis, the same principle that appears to defeat dodder attachment. Against fungal pathogens, glandular trichomes release antimicrobial compounds upon rupture. The dodder interaction thus sits at the intersection of these two classical functions, combining a mechanical exclusion role with a chemical warfare role. This convergence suggests that trichomes may have been recruited repeatedly in plant evolution as general-purpose barriers against anything that attempts to breach the epidermis, whether animal, fungal, or plant.

From the parasite’s perspective, the findings illuminate the challenges that Cuscuta faces when encountering a well-defended host. Dodder haustorium formation is known to be influenced by host-derived chemical signals, and parasites can discriminate among potential hosts based on volatile and contact cues. A host whose surface is obscured by trichomes presents a fundamentally different sensory and mechanical environment. The parasite may perceive fewer contact signals, may be unable to apply sufficient pressure, and may be exposed to repellent or toxic metabolites simultaneously. This layered obstruction helps explain why host range in Cuscuta species is broad but not universal, and why some host combinations consistently fail.

The experimental design deserves attention for its ecological realism. By using mung bean plants pre-parasitized by dodder as a source of secondary infection, the researchers reproduced the natural mode of dodder spread through plant communities, rather than relying solely on artificial placement of seedlings. This two-stage system, combining primary infestation assays with neighbor-based secondary transmission, provides a more faithful model of how resistance traits would perform in the field. The replication across three independent biological experiments with varying plant numbers also strengthens confidence that the observed attachment failure rates are robust rather than artifacts of a single cohort.

Practical implications follow naturally from these results. If stem trichome density and morphology can be measured and selected for, tomato breeders could screen germplasm for lines with enhanced pre-attachment resistance to dodder. Such resistance would be valuable precisely because it acts before any vascular connection forms, preventing yield loss rather than merely limiting it. Moreover, a physical barrier is less likely to be overcome by parasite adaptation than some single-gene resistances, since the parasite would need to evolve both the mechanical force and the chemical tolerance to penetrate a dense trichome layer. Combining trichome-based resistance with known post-attachment defenses could produce durable, multi-layered protection.

There are also broader ecological questions raised by the work. In natural ecosystems, trichome density varies with environmental conditions such as light, water availability, and herbivore history. Plants growing under stress often produce denser or taller trichomes, which means that the same trait that helps against drought and insects might incidentally influence susceptibility to parasitic plants. Conversely, agricultural selection for smooth, easily handled fruit and foliage may have reduced trichome cover in some cultivated lines, potentially increasing vulnerability to dodder. Understanding these trade-offs could inform both crop improvement and the study of plant-plant interactions in wild communities.

The study also highlights a gap in the scientific literature that the authors correctly identify. Reviews of trichome function rarely mention parasitic plants, and reviews of plant resistance to parasitic plants rarely mention trichomes. This mutual blind spot has likely persisted because parasitic plant research has historically focused on root parasites such as Striga and Orobanche, where host interactions occur underground and trichomes are irrelevant. Stem parasites like Cuscuta, which must contact the aerial epidermis directly, are the natural context in which trichome defenses would be expected, and this study demonstrates that expectation convincingly.

Future research directions suggested by these findings include identifying the specific metabolites released by type VI trichomes during dodder attack, quantifying whether the released compounds are toxic to the parasite or merely deterrent, and testing whether trichome density correlates with resistance across diverse tomato genotypes. Genetic analysis of natural variation in stem trichome traits could reveal loci that breeders could manipulate. Additionally, examining whether other Cuscuta species or other stem parasites face similar barriers on different host species would establish how general this defense mechanism is across plant-parasite systems.

In sum, the work reframes an ordinary feature of the plant surface as an active and multifunctional defense organ. The long trichomes of tomato stems deny dodder seedlings the contact they need, and the glandular trichomes respond dynamically when infestation is attempted, contributing both chemistry and structural material to the host’s defense. That such a familiar structure, visible to any observer of a tomato plant, could play a decisive role against one of agriculture’s most unusual pests is a reminder that major discoveries in plant science sometimes hide in plain sight, waiting for someone to look closely at the interface between two organisms that rarely meet in the literature.

Subject of Research: An overlooked function of trichomes in defense against parasitic plants

Article Title: An overlooked function of trichomes in defense against parasitic plants

Article References: Frey, C., López-López, L., Martínez-Toral, A., & Acebes, J. L. (2026). An overlooked function of trichomes in defense against parasitic plants. Frontiers in Plant Physiology, 4, Article 1894074. https://doi.org/10.3389/fphgy.2026.1894074

Image Credits: AI Generated

DOI: 10.3389/fphgy.2026.1894074

Keywords: trichomes, tomato, Cuscuta campestris, dodder, plant defense, parasitic plants, pre-attachment resistance, glandular trichomes, haustoria, plant physiology, host-parasite interaction, Solanum lycopersicum

Fusarium wilt, caused by the soilborne fungus Fusarium oxysporum, is among the most economically damaging diseases of tomato. The pathogen invades the plant’s vascular system, blocking water transport and causing wilting, stunting, and often plant death. Conventional control relies heavily on fungicides, resistant cultivars, and crop rotation, but these approaches face mounting challenges from pathogen adaptability, environmental concerns, and the loss of effective chemical tools. Biological control using beneficial soil microorganisms has emerged as a promising alternative, yet the precise mechanisms by which root-associated bacteria confer systemic resistance have remained incompletely understood, particularly with respect to the metabolic reprogramming that occurs throughout the whole plant.

The research team, led by Zhaoxia Jin, constructed a synthetic bacterial consortium composed of three soil-derived strains: Bacillus velezensis YY13, Bacillus subtilis JN1, and Pseudomonas chlororaphis JN72. These species are well-known root colonizers frequently isolated from disease-suppressive soils. Rather than testing each strain individually, the researchers deliberately assembled them into a synthetic community, or SynCom, and introduced the mixture to tomato roots before challenging the plants with the Fusarium wilt pathogen. This design allowed the team to evaluate how a defined microbial community, rather than a single isolate, influences plant immunity across multiple levels of biological organization.

The results were striking. Plants whose rhizosphere soil had been colonized by the SynCom exhibited a 33.49 percent reduction in disease severity compared with untreated controls, along with significantly enhanced biomass. These agronomic improvements were accompanied by profound shifts in the plant’s secondary metabolism, the branch of biochemistry responsible for producing specialized compounds such as flavonoids, phenylpropanoids, and other defense-related molecules. Using untargeted metabolomics, a technique that profiles thousands of metabolites simultaneously without bias toward known compounds, the researchers discovered that the bacterial consortium triggered distinct metabolic alterations in different plant tissues.

In the roots, the most notable change was a 2.1-fold elevation of feruloyltyramine glycosides, a class of phenylpropanoid conjugates known for their antifungal properties and their role in reinforcing cell walls against pathogen attack. In the leaves, the researchers observed a 1.8-fold accumulation of quercetin-O-rutinoside, a flavonoid glycoside with antioxidant and antimicrobial activities. Perhaps most intriguingly, the team found evidence that the bacterial consortium redirected carbon flux within the phenylpropanoid pathway, shifting resources away from lignin precursors, which are primarily structural, and toward antifungal metabolites that directly inhibit pathogen growth. This metabolic rerouting represents a sophisticated form of resource allocation in which the plant prioritizes chemical defense over structural reinforcement when guided by its bacterial partners.

To understand how these metabolic shifts were orchestrated, the researchers performed transcriptional profiling across different tissues and time points. They found that the reprogramming of gene expression was spatiotemporally specific, meaning that particular genes were activated in particular tissues at particular stages of the interaction. In the roots, genes encoding key enzymes of the phenylpropanoid and flavonoid biosynthesis pathways, including phenylalanine ammonia-lyase (PAL), 4-coumarate-CoA ligase (4CL), and chalcone synthase (CHS), were upregulated early in the response. These enzymes catalyze the initial steps that channel carbon from phenylalanine into the phenylpropanoid network, setting the stage for the production of diverse defense compounds.

Notably, the activation of flavanone 3-hydroxylase (F3H), an enzyme that directs flux toward flavonoid production, occurred later and preferentially in the leaves rather than the roots. This temporal and spatial coordination suggests that the plant first establishes a root-based chemical barrier and then extends its defensive chemistry to aerial tissues, creating a systemic state of heightened alertness. The transcriptional changes were synchronized with the induction of pathogenesis-related (PR) genes mediated by the jasmonic acid and ethylene signaling pathways, two hormone systems that are centrally involved in plant defense against necrotrophic pathogens such as Fusarium. The coupling of secondary metabolism with hormone signaling indicates that the bacterial consortium does not merely stimulate random metabolic activity but instead coordinates a coherent, multi-layered immune response.

One of the most remarkable discoveries of the study concerns the role of root-exuded flavonoids in shaping the rhizosphere microbiome. The researchers found that the SynCom-treated plants released elevated levels of the flavonoids naringenin and quercetin into the surrounding soil. These compounds acted as signaling molecules that reshaped the composition of the rhizosphere microbial community, enriching for members of the phylum Actinobacteria, which accounted for 27 percent of the community, and recruiting plant-protective bacterial genera including Bacillus and Pseudomonas. This finding reveals a self-reinforcing loop in which the initial bacterial inoculum triggers plant metabolic changes that, in turn, attract additional beneficial microbes from the soil, amplifying the defense priming signal through positive feedback involving the jasmonic acid, ethylene, and PR gene pathways.

The authors describe this mechanism as a tripartite defense system operating at three interconnected levels. First, the microbial consortium reprograms phenylpropanoid channeling to prioritize defensive metabolites over structural polymers, effectively reallocating the plant’s biochemical resources toward active chemical warfare against the pathogen. Second, it elicits tissue-specific immune transcription that coordinates root and leaf responses in a temporally precise manner. Third, it sustains resistance over time through flavonoid-mediated microbiome recruitment, ensuring that the protective community is continuously replenished and reinforced. The researchers refer to this self-amplifying cycle as a phyto-microbial loop, a paradigm that extends the concept of ecological feedback loops into the realm of plant immunity and offers a framework for designing more effective synthetic microbial communities for agriculture.

The implications of this work extend well beyond tomato and Fusarium wilt. By demonstrating that a defined three-member bacterial consortium can systemically rewire plant secondary metabolism, redirect metabolic flux, coordinate hormone signaling, and reshape the rhizosphere microbiome, the study provides a blueprint for engineering plant microbiomes that enhance disease resistance across diverse crop systems. As agriculture faces increasing pressure to reduce chemical inputs and adopt sustainable practices, understanding the molecular dialogue between roots, microbes, and soil communities becomes ever more critical. This research not only deepens our fundamental knowledge of plant-microbe interactions but also points toward practical applications in which synthetic communities, informed by the principles of metabolic reprogramming and microbiome feedback, could become powerful tools in the fight against soilborne diseases.

Subject of Research: How a synthetic soil bacterial consortium induces systemic metabolic and immune reprogramming in tomato to enhance resistance against Fusarium wilt

Article Title: Soil-derived bacterial root commensals induce systemic alterations of defence-related secondary metabolism and response in tomato whole plants for favoring resistance against Fusarium wilt

Article References: Jin, Z., Liu, X., Li, B., Gao, X., Chen, L., Chen, X., & Guo, Y. (2026). Soil-derived bacterial root commensals induce systemic alterations of defence-related secondary metabolism and response in tomato whole plants for favoring resistance against Fusarium wilt. Plant and Soil. https://doi.org/10.1007/s11104-026-09138-7

Image Credits: AI Generated

DOI: 10.1007/s11104-026-09138-7

Keywords: Fusarium wilt, tomato, synthetic bacterial consortium, rhizosphere microbiome, phenylpropanoid pathway, flavonoids, defense priming, systemic resistance, jasmonic acid, ethylene, plant secondary metabolism, biological control