The researchers prepared the nanoparticles, designated TA-AgNPs, by adding 1 mL of aqueous Trachyspermum ammi seed extract to 10 mL of 1.5 mM silver nitrate and stirring the mixture for five minutes at 25 °C. The solution changed from pale yellow to dark brown, a visible change the team treated as confirmation of reduction. UV-visible spectroscopy showed a prominent absorption peak at 420 nm. Dynamic light scattering and zeta analysis indicated a mean hydrodynamic diameter of 34.27 nm, an average zeta potential of −28 mV and a polydispersity index of 0.255. The particles were also characterized by scanning electron microscopy and Fourier-transform infrared spectroscopy, and the authors described them as spherical and nanoscale.

The seed extract was prepared by shaking 10 g of powdered T. ammi seeds in 100 mL of double-deionized water for approximately four hours at 37 °C before filtering the mixture. The researchers proposed that constituents associated with the plant’s essential oil, including thymol, p-cymene and gamma-terpinene, could serve as reducing agents during silver nanoparticle formation. Plant-mediated synthesis may also leave biologically active plant compounds associated with the silver surface, potentially influencing how the particles interact with cells. The experiment therefore tested TA-AgNPs as a combined product of silver and plant-derived material, but it did not isolate the effect of individual seed constituents or establish which chemical features were responsible for the observed activity.

In the cell-culture experiment, A431 human epidermal skin-cancer cells were exposed for 24 hours to TA-AgNPs at concentrations of 2.5, 5, 10, 20 and 25 micrograms per milliliter. Cell viability was assessed with the Alamar Blue assay, which detects the metabolic reduction of resazurin to fluorescent resorufin. Viability declined as nanoparticle concentration increased. At 20 micrograms per milliliter, viability averaged 20.2% for TA-AgNPs compared with 86.8% for the corresponding seed extract alone; at 25 micrograms per milliliter, the respective values were 11.9% and 87%. These differences were significant at p less than 0.01, whereas differences at 2.5, 5 and 10 micrograms per milliliter were reported as non-significant. The result supports a concentration-dependent cytotoxic effect in one human cancer cell line, but the supplied results include no non-cancer cell comparator, benchmark anticancer treatment or reported half-maximal inhibitory concentration.

For the animal experiment, 25 male Swiss albino mice aged six to seven weeks and weighing 28–35 g were divided into five groups of five. Skin carcinogenesis was induced by topical application of 7,12-dimethylbenz[a]anthracene, or DMBA, at 50 mg/kg, followed by 12-O-tetradecanoylphorbol-13-acetate, or TPA, at 0.01 micrograms per microliter three times weekly for 14 weeks. One group received only the carcinogens. Three intervention groups also received 0.1 mg/mL TA-AgNPs in carbopol gel, corresponding to 25 micrograms per kilogram per day: treatment began after DMBA, began after TPA, or continued throughout the full carcinogenesis protocol. A fifth group received TA-AgNPs without either carcinogen. The investigators measured tumor incidence, yield, burden, dimensions, weight, height and latency, along with liver superoxide dismutase activity, serum interleukin-6 and skin histopathology.

Continuous treatment produced the clearest change in tumor outcomes. All five mice in the carcinogen-only group developed tumors, with a reported tumor yield of 100%, an average tumor burden of five and tumors first appearing in week four. Their average latent period was five weeks. Starting TA-AgNPs after DMBA did not reduce incidence or yield, although tumor burden fell to 4.32 and the average latent period increased to six weeks. Starting treatment after TPA likewise left incidence and yield at 100%, while burden declined to 3.96 and latency increased to seven weeks. With TA-AgNPs administered throughout, tumor incidence and yield were each reported as 20%, average tumor burden fell to 1.71 and the average latent period reached nine weeks. The average tumor diameter changed little among carcinogen-exposed groups, remaining between 4.22 and 4.55 mm, indicating that the clearest measured effects involved the occurrence, number and timing of tumors rather than the size of tumors that did develop.

Oxidative-stress measurements suggested that the protective pattern depended on treatment duration. Liver superoxide dismutase activity fell to 25.52 ± 0.032 units per 50 microliters in the carcinogen-only group, compared with 34.90 ± 0.60 units per 50 microliters in untreated mice, a difference reported at p less than 0.01. TA-AgNPs introduced after DMBA or after TPA produced values of 45.22 ± 0.008 and 43.34 ± 0.005 units per 50 microliters, respectively, but neither differed significantly from the carcinogen control. Continuous TA-AgNP treatment raised activity to 55.41 ± 0.006 units per 50 microliters, a significant increase relative to the carcinogen group. The nanoparticle-only group measured 26.20 ± 0.049 units per 50 microliters and did not differ significantly from the carcinogen control. This pattern is consistent with an association among sustained administration, higher antioxidant-enzyme activity and reduced tumor burden, but the experiment does not establish that SOD upregulation caused the protective effect.

Serum interleukin-6 measurements showed that the anti-inflammatory interpretation was more limited. The cytokine rose to 181.60 ± 0.75 picograms per milligram of protein in the carcinogen-only group, compared with 63.30 ± 0.30 picograms per milligram in untreated mice. Beginning TA-AgNPs after DMBA failed to lower IL-6 and instead yielded 198.50 ± 0.85 picograms per milligram. Treatment after TPA reduced IL-6 to 163.20 ± 0.60 picograms per milligram, and continuous treatment produced a similar value of 162.80 ± 0.65 picograms per milligram; both were significantly lower than the carcinogen control at p less than 0.01, yet both remained well above the untreated baseline. Mice receiving TA-AgNPs without carcinogens had 65.20 ± 1.00 picograms per milligram, close to baseline. The data therefore indicate a partial, schedule-dependent reduction in IL-6 rather than elimination of the carcinogen-associated inflammatory environment.

Histopathological findings broadly supported the tumor measurements but also showed why the findings should not be described as a cure. Hematoxylin-and-eosin-stained skin sections contained squamous-cell-carcinoma features and keratin pearls in the carcinogen-only group and in each group that received TA-AgNPs alongside carcinogens, although the extent differed among treatment schedules. In the nanoparticle-only group, no tumors appeared, no keratin pearls were observed and epithelial architecture remained preserved. Quantitative results were summarized as means with standard deviations and compared through one-way analysis of variance followed by Tukey’s post hoc honestly significant difference test; the cell assay used three replicates. The small animal number, use of only one sex and one chemically induced mouse model, absence of a clinical comparator, and lack of long-term toxicity or pharmacokinetic analysis limit translation. The study identifies plant-mediated nanosilver as an experimental chemopreventive candidate, but it does not establish efficacy, safety or dosing for people with cancer.

Subject of Research: Experimental evaluation of Trachyspermum ammi-mediated silver nanoparticles for skin-cancer chemoprevention

Article Title: Trachyspermum ammi seed extract modulated nanosilver as a transformative agent for anticancer activity

Article References: Saxena, N., Jain, S., Yadav, N., Sharma, B., Kasodekar, S. A., Gupta, N., & Chatterjee, S. (2026). Trachyspermum ammi seed extract modulated nanosilver as a transformative agent for anticancer activity. Frontiers in Biomaterials Science, 5, Article 1942456. https://doi.org/10.3389/fbiom.2026.1942456

Image Credits: AI Generated

DOI: 10.3389/fbiom.2026.1942456

Keywords: Trachyspermum ammi, silver nanoparticles, green synthesis, skin cancer, A431 cells, DMBA-TPA model, tumor incidence, antioxidant defense, interleukin-6, mouse model, Trachyspermum, ammi

Camellia oleifera is one of China’s most important woody oil crops, cultivated extensively for its seeds, which yield high-quality edible oil. However, like many crops, its growth and productivity are frequently constrained by drought stress, a challenge that is becoming increasingly severe as climate patterns shift. The REVEILLE family of genes, which includes RVE1, plays crucial roles in plant stress responses, yet their functions in C. oleifera remained largely unexplored before this study. The researchers set out to clone the RVE1 homolog from C. oleifera and investigate whether it contributes to drought tolerance, a question with significant implications for the genetic improvement of woody oil crops.

The team began by cloning CoRVE1 and analyzing its expression patterns under various stress conditions. Expression analyses revealed that CoRVE1 was significantly induced by drought, salt, and abscisic acid (ABA) treatments, indicating that the gene responds to multiple stress signals. ABA is a key plant hormone involved in stress responses, and its involvement suggests that CoRVE1 may be integrated into the ABA-dependent stress signaling pathway. The gene also displayed tissue-specific expression patterns, providing clues about where in the plant it exerts its effects. These findings positioned CoRVE1 as a promising candidate for functional characterization through heterologous overexpression.

To test the gene’s function directly, the researchers overexpressed CoRVE1 in Arabidopsis thaliana, a widely used model plant that allows rapid genetic analysis. The results were striking. Two overexpression lines showed markedly enhanced drought tolerance, with survival rates of 84% and 86% after drought treatment, compared with only 20% in wild-type plants. In detached-leaf water-loss assays, the transgenic lines lost water at a rate of 7.6% and 7.2% after 200 minutes, compared with 9% in the wild type, indicating improved water retention. The overexpression lines also promoted plant growth under stress conditions, suggesting that CoRVE1 does not simply trade growth for survival but supports both.

Physiological analyses provided mechanistic insight into how CoRVE1 enhances drought tolerance. The transgenic lines showed enhanced antioxidant capacity, with increased activities of superoxide dismutase (SOD), peroxidase, and catalase. After 10 days of drought, SOD activity increased by 84.6–85.7% in the transgenic lines, compared with 37.6% in the wild type. These enzymes neutralize reactive oxygen species, which accumulate during drought stress and damage cellular components. Consistent with this protective effect, malondialdehyde accumulation, a marker of oxidative damage to membranes, was reduced by 17–18% under drought stress in the overexpression lines. This reduction indicates that CoRVE1-overexpressing plants suffer less membrane damage when water is scarce.

Beyond antioxidant defense, the transgenic lines showed improved osmotic adjustment, reflected by altered accumulation of proline, soluble sugars, and soluble proteins. Osmotic adjustment is a critical drought-response mechanism in which plants accumulate compatible solutes to maintain cellular water content and turgor pressure under water deficit. Proline, in particular, is a well-known osmoprotectant that stabilizes proteins and membranes while contributing to osmotic balance. The altered accumulation of these solutes in CoRVE1-overexpressing plants suggests that the gene enhances the plant’s ability to maintain physiological function during drought by improving osmotic regulation at the cellular level.

At the molecular level, the researchers found that several drought-responsive genes were significantly upregulated in CoRVE1-overexpressing plants. These included RD29A, RD22, KIN1, COR15A/B, LEA14, LEA76, and CER3, as well as NCED3, a gene involved in ABA biosynthesis. RD29A and RD22 are classic drought-inducible genes whose activation is a hallmark of the plant drought response. LEA proteins, encoded by LEA14 and LEA76, protect cellular structures during dehydration. NCED3 is a rate-limiting enzyme in ABA biosynthesis, and its upregulation suggests that CoRVE1 may enhance ABA accumulation, thereby amplifying the ABA-dependent stress signaling cascade. The coordinated upregulation of this gene network indicates that CoRVE1 acts upstream of multiple drought-response pathways rather than on a single target.

The findings suggest that CoRVE1 positively contributes to drought tolerance by enhancing antioxidant defense and osmotic adjustment and is associated with the upregulation of stress-related genes. This study provides new insights into the drought response of C. oleifera and identifies CoRVE1 as a potential candidate gene for further functional study and genetic improvement of drought resistance in woody oil crops. The research was funded by the Hunan Key Technologies Research and Development Program and the Hunan Provincial Forestry Science and Technology Research and Innovation Fund Project, reflecting regional investment in oil-tea improvement.

For a crop that anchors rural economies across southern China, the identification of a transcription factor that can be engineered to boost drought survival represents a meaningful step toward climate-resilient oil-tea plantations. While the current work was performed in a heterologous system, the strong physiological and molecular evidence positions CoRVE1 as a compelling target for future breeding programs. As drought intensifies across agricultural regions worldwide, genes like CoRVE1 may prove essential tools in the effort to sustain productivity of woody oil crops under increasingly unpredictable conditions.

Subject of Research: Plant Biology

Article Title: Overexpression of Camellia oleifera CoRVE1 enhances drought tolerance in transgenic Arabidopsis thaliana

Article References: Ma, X., He, Z., Yang, D., Zhang, Y., Xun, C., Ma, Y., Wang, R., & Chen, Y. (2026). Overexpression of Camellia oleifera CoRVE1 enhances drought tolerance in transgenic Arabidopsis thaliana. BMC Plant Biology. https://doi.org/10.1186/s12870-026-09866-z

Image Credits: AI Generated

DOI: 10.1186/s12870-026-09866-z

Keywords: drought tolerance, CoRVE1, Camellia oleifera, transcription factor, Arabidopsis thaliana, ABA signaling, antioxidant defense, osmotic adjustment, oil-tea, BMC Plant Biology, Overexpression, Camellia

The choice of wheat as the experimental subject reflects both its global importance and its well-documented sensitivity to salinity during early development. Wheat is among the most widely cultivated cereals on Earth, and in many irrigated production systems—particularly in arid and semi-arid regions of Central and Western Asia, North Africa, and Australia—the water available to farmers carries substantial dissolved salt loads. Seedling establishment is a particularly vulnerable window, because young plants have limited root systems, thin cuticles, and immature antioxidant machinery. A seedling that survives early salt exposure with reduced vigor often carries that penalty through to tillering and grain fill, which is why interventions aimed specifically at the seedling stage can have disproportionate agronomic value even when the plants eventually recover.

The two cultivars examined in the study, Chamran and Mehregan, are bread wheat varieties bred for the contrasting but overlapping challenges of Iranian and regional production environments. Including two genotypes rather than one matters scientifically because salt responses in wheat are strongly genotype-dependent: varieties differ in their capacity to exclude sodium at the root, to compartmentalize it in vacuoles, and to maintain photosynthetic activity under osmotic strain. When a treatment effect appears in both cultivars, as the fresh-weight benefit of the combined formulation did at every salinity level tested, it suggests a mechanism that operates broadly rather than one contingent on a particular genetic background. At the same time, the magnitude of the benefit differed between the two lines, with Mehregan showing a larger relative gain at the highest salt concentration, a reminder that biostimulant performance cannot be assumed to transfer uniformly across germplasm.

The severity of the salt treatments deserves attention when interpreting the results. Irrigating with 150 millimolar sodium chloride already imposes stress well beyond what most productive wheat fields experience; 300 millimolar approaches the limits of what wheat seedlings can tolerate at all. These concentrations were chosen to create a steep stress gradient in which protective effects could be detected unambiguously, not to mimic field conditions directly. The fact that plant height, fresh weight, and dry weight all declined substantially at the highest concentration in both cultivars confirms that the stress was genuinely severe. Against that backdrop, even modest absolute differences in biomass between sprayed and unsprayed plants represent meaningful biological protection, and the roughly thirty-five percent fresh-weight advantage of the combined treatment over the unsprayed control in Chamran at 300 millimolar sodium chloride is notable.

Chitosan itself has a long history as a plant-protective agent, and its mechanism of action is worth unpacking. Derived by deacetylation of chitin from crustacean shells or fungal cell walls, chitosan is a positively charged polysaccharide that can interact with negatively charged components of plant cell surfaces. It is recognized by plants as a microbe-associated molecular pattern, triggering innate immune signaling pathways that overlap with those activated during abiotic stress. Spraying chitosan on leaves has been reported to induce stomatal closure, stimulate the phenylpropanoid pathway, and prime antioxidant enzymes, effects that collectively harden plants against subsequent stress. The polymer also forms films, which is why it is used commercially as an edible coating for fruit; on a leaf, that film-forming behavior may both retain moisture and slow the diffusion of dissolved solutes.

Selenium occupies an unusual position in plant biology. It is not considered an essential element for higher plants, yet at low concentrations it reliably alleviates oxidative stress in many species. The reason lies in its chemistry: selenite taken up by leaf tissue can be assimilated into selenocysteine and ultimately into selenium-containing forms that bolster the glutathione peroxidase system, an alternative route for decomposing lipid peroxides that complements the ascorbate-glutathione cycle. Selenium supplementation has also been shown to enhance the activity of catalase and superoxide dismutase and to slow chlorophyll degradation under stress. The dose window is narrow, however, because selenium becomes toxic to plants at concentrations only modestly above those that are beneficial, which makes delivery method and formulation critical variables in any field application.

The formulation strategy used in the study—ionotropic gelation with tripolyphosphate—is a standard technique for assembling chitosan into small cross-linked particles. When a tripolyphosphate solution is added to an acidic chitosan solution, the multivalent anion bridges the cationic polymer chains, condensing them into discrete nanoparticles. Incorporating sodium selenite into this process entraps or associates the selenium species within the particle matrix rather than leaving it as a free salt on the leaf surface. The practical rationale is that a particle-associated active ingredient may adhere better to the waxy cuticle, release its payload more gradually, and suffer less from rapid wash-off or photodegradation than a simple aqueous spray. The authors were careful, however, to note that the physicochemical properties of their specific formulation—particle size, surface charge, selenium loading efficiency, and release kinetics—were not characterized in this work, leaving an important gap between the concept and a fully validated delivery system.

The confocal microscopy experiment using fluorescein isothiocyanate-labeled chitosan provides some of the most visually direct evidence in the paper. Fluorescence was strongest in the epidermal layer and weaker in the underlying mesophyll, indicating that the polymer associates readily with the outer leaf tissues but penetrates only partially into the interior. This pattern is consistent with what is known about foliar uptake in general: the cuticle is a formidable hydrophobic barrier, and most solutes enter through stomata, trichomes, or specialized epidermal cells rather than diffusing across the cutin matrix. The authors are appropriately cautious in their interpretation, emphasizing that detecting the labeled chitosan demonstrates association with the leaf but does not prove that selenium, or the intact formulation, was internalized. Tracking the selenium itself would require a different analytical approach, such as isotope labeling or elemental imaging.

The gene expression data add a molecular dimension to the physiological observations. The genes examined span several functional categories that map directly onto the known components of salt stress. TaAPX and TaCAT encode ascorbate peroxidase and catalase, the two central enzymes of hydrogen peroxide detoxification. TaNHX1 encodes a vacuolar sodium-proton antiporter that sequesters sodium ions inside vacuoles, removing them from the cytoplasm where they would interfere with enzymatic function. TaHKT9-7D belongs to the high-affinity potassium transporter family, whose members participate in sodium retrieval and potassium-sodium balance in both roots and leaves. TaP5CS catalyzes the rate-limiting step in proline biosynthesis, and Ta4CL3-6B encodes a 4-coumarate ligase acting early in the phenylpropanoid pathway, which supplies lignin precursors and a wide range of protective secondary metabolites. TaPXPAO is involved in polyamine catabolism, a process that both generates hydrogen peroxide and participates in stress signaling.

The pattern of expression changes tells a coherent story. In unsprayed plants, salt exposure actually decreased the transcript levels of most of these genes, a somewhat counterintuitive result that may reflect stress-imposed suppression of transcription or a failure of the seedlings to mount a full defensive response at the severe concentrations used. The single gene that rose, TaP5CS, aligns with the accumulation of proline, the classic osmoprotectant whose synthesis plants upregulate under water stress. In contrast, the selenium-containing treatments at the highest salt level elevated TaCAT, TaNHX1, and Ta4CL3-6B in both cultivars, suggesting activation of antioxidant defense, sodium compartmentalization, and phenylpropanoid metabolism respectively. The combined formulation additionally influenced the polyamine catabolism gene, hinting at a broader reprogramming of stress metabolism when the two biostimulants act together.

The authors are explicit that these expression changes are correlative: no enzyme activities, metabolite quantities, or ion contents were measured to confirm that the transcriptional shifts translated into functional differences. This is a standard and honest limitation of RT-qPCR surveys, and it defines the agenda for follow-up work. Measuring catalase activity, tissue sodium and potassium concentrations, proline levels alongside TaP5CS expression, and phenylpropanoid end products would connect the molecular signals to the growth outcomes. Similarly, the weak correlation between growth traits and pigment contents, with correlation coefficients not exceeding 0.30, indicates that the fresh-weight benefit of the treatment cannot be explained simply by preserved chlorophyll; other processes, such as osmotic adjustment, membrane stability, or ion homeostasis, are likely contributing.

The proline data illustrate this point nicely. Proline rose with increasing salinity in the selenium-treated and combined-treatment plants, consistent with induced TaP5CS expression, and proline serves multiple roles beyond osmotic adjustment: it scavenges reactive oxygen species directly, stabilizes proteins and membranes, and buffers cellular redox state. A treatment that enhances proline accumulation under salt stress therefore plausibly contributes to the observed biomass protection through mechanisms invisible to chlorophyll measurements. Disentangling how much of the growth benefit flows through osmotic protection versus antioxidant reinforcement versus ion management will require the kind of integrative physiological follow-up the authors themselves call for.

From an applied perspective, the study sits within a growing literature on biostimulants as complements to conventional breeding and soil management for salinity adaptation. Breeding for salt tolerance in wheat has proven slow because tolerance is controlled by many genes of modest effect and is strongly environment-dependent. Foliar interventions offer a complementary route: they can be applied reactively when salinity is known to be a problem, combined with existing agronomic practice, and adjusted by dose and timing. The caveats the authors raise—uncharacterized formulation physics, seedling-stage results only, controlled-environment conditions, and no field validation—are the standard hurdles between a promising greenhouse result and a usable product, and their candor about them strengthens rather than weakens the study’s contribution. The work was supported by Hungarian national research funding through the Thematic Excellence Program and the NRDI Fund, and the article is published open access under a Creative Commons license, making the full dataset and methods available to any research group wishing to build on these findings.

Subject of Research: Foliar chitosan–selenite biostimulant effects on wheat seedlings under salt stress

Article Title: Foliar chitosan–selenite formulation improves wheat seedling growth under NaCl irrigation

Article References: Gholizadeh, F., Fábián, A., Sohail, H., Majláth, I., & Janda, T. (2026). Foliar chitosan–selenite formulation improves wheat seedling growth under NaCl irrigation. BMC Plant Biology. https://doi.org/10.1186/s12870-026-10095-7

Image Credits: AI Generated

DOI: 10.1186/s12870-026-10095-7

Keywords: wheat, salinity stress, chitosan, selenium, foliar application, biostimulants, gene expression, antioxidant defense, proline, confocal microscopy, plant physiology, NaCl

The study, published in Frontiers in Plant Physiology, represents the first genome-wide transcriptomic analysis of C. teeta under drought and heat stress. Led by Manabendra Nath and Bhaben Tanti, the research team collected saplings from Myodia Pass in Arunachal Pradesh at 2,580 meters elevation, then subjected them to controlled drought — withholding water until visible dehydration appeared after roughly two weeks — and heat stress at 43°C for six hours. Using RNA sequencing on an Illumina NovaSeq 6000 platform, they captured the plant’s entire transcriptional response at the moment of crisis, generating between 33 and 44 million clean reads per sample.

The numbers alone tell a striking story. Drought stress triggered 3,099 differentially expressed genes (DEGs), heat stress activated 816, and combined stress produced 3,790 — a synergistic reshaping far exceeding either stress alone. But the most revealing finding was how little overlap existed between the two responses. Of the top 500 upregulated genes, only six were shared across all comparisons. Just 122 DEGs overlapped between drought and heat treatments overall, confirming that this plant deploys fundamentally different molecular arsenals depending on the nature of the threat.

Under drought, C. teeta essentially shut down its photosynthetic machinery. Genes encoding chlorophyll a/b binding proteins, photosystem II components, thylakoid lumen proteins, and ribosomal proteins were strongly downregulated — a classic energy-conservation strategy that sacrifices growth for survival. Simultaneously, the plant ramped up lipid transport, vesicle trafficking, aquaporin activity, and cell-wall remodeling, mobilizing resources to maintain cellular integrity. Genes like ZAT12, SnRK2.6, DREB2A, AREB1, and LEA14 formed a temporal cascade from early signaling through transcriptional regulation to late-stage structural protection of proteins and membranes.

Heat stress told a completely different story. Rather than suppressing photosynthesis as dramatically, the plant activated a focused proteostasis network — roughly 22 heat-responsive genes dominated by the HSP20, HSP40 (DNAJ), HSP70/Clp, and heat shock factor (HSF) families. These molecular chaperones prevent protein denaturation and aggregation under thermal stress, essentially acting as cellular bodyguards. The enrichment of protein folding, refolding, and ATP-dependent chaperone activity in gene ontology analysis confirmed that C. teeta prioritizes keeping its existing proteins functional over producing new ones when temperatures spike.

Perhaps the most intriguing discovery involves the plant’s antioxidant strategy. Under both stresses, enzymatic antioxidants — ascorbate peroxidase (APX), superoxide dismutase (SOD), and glutathione peroxidase (GPX) — were significantly upregulated, while thioredoxin and glutaredoxin redox regulators were suppressed. This represents a strategic shift from thiol-based redox buffering toward peroxidase-driven detoxification of reactive oxygen species (ROS). The researchers interpret this as an energy-efficient reallocation: peroxidases consume less cellular energy than maintaining the full thioredoxin-peroxiredoxin cycling system, allowing the plant to neutralize hydrogen peroxide and superoxide radicals without depleting already-scarce resources.

Transcription factors emerged as the master conductors of this molecular orchestra. The NAC, DREB, WRKY, bZIP, and HSF families showed strong stress-specific induction, with DREB2A, AREB1, and HSFA2 acting as central regulatory hubs. Under drought, NAC family members — particularly NAM, ATAF1/2, and CUC2 — coordinated dehydration tolerance, while growth-associated GRAS and ARF families were downregulated, consistent with the plant’s decision to halt development. Under heat, HSF-A2 and zinc-finger proteins took center stage, driving the chaperone response. The shared induction of NAC, WRKY, and AP2/ERF under both stresses suggests cross-talk between drought and heat signaling networks, hinting at conserved regulatory architecture.

But the most consequential finding for medicine — and for the plant’s future — concerns its benzylisoquinoline alkaloid (BIA) biosynthesis pathway. Early pathway genes, especially S-norcoclaurine synthase (NCS), the rate-limiting entry point, were significantly upregulated under drought, suggesting enhanced precursor formation. Yet downstream enzymes — norcoclaurine 6-O-methyltransferase, berberine bridge enzyme (BBE), stylopine synthase (CYP719A), and multiple cytochrome P450 monooxygenases — were consistently downregulated. This creates a metabolic bottleneck: precursors accumulate, but the plant cannot complete the conversion to berberine and coptisine. The researchers interpret this as a survival trade-off, redirecting metabolic resources from alkaloid diversification toward antioxidant defense and osmotic adjustment.

Quantitative real-time PCR validation confirmed the RNA-Seq results for eight key genes, including ZAT12, DREB2A, APX, NAC, HSP, and HSF, demonstrating that drought preferentially activates redox and dehydration signaling while heat strongly induces thermotolerance pathways. The consistency between transcriptomic and qRT-PCR data lends credibility to the genome-wide findings and establishes a reliable molecular reference for future functional studies.

The implications extend far beyond a single endangered species. As climate change intensifies drought and heat extremes across mountain ecosystems worldwide, moisture-dependent medicinal plants face existential pressure. This transcriptomic resource — publicly available through NCBI BioProject PRJNA1313294 — provides candidate genes for conservation genomics, stress-tolerance enhancement, and climate-resilient cultivation strategies. For C. teeta, whose natural populations are steadily declining due to prolonged dry spells and rising temperatures, understanding these molecular survival mechanisms may be the difference between extinction and adaptation. For pharmacology, it reveals how environmental stress reshapes the very chemistry that makes this plant valuable — a warning that the medicines of tomorrow may depend on how well we protect the molecular flexibility of the plants that produce them today.

Subject of Research: Transcriptomic responses of the endangered Himalayan medicinal plant Coptis teeta to drought and heat stress

Article Title: Transcriptomic analysis reveals differential gene expression and metabolic reprogramming in Coptis teeta Wall. under drought and heat stress

Article References: Nath, M., Bhattacharjya, D. K., Regon, P., Goswami, D., Kalita, K., Boro, K., Kundu, B. K., & Tanti, B. (2026). Transcriptomic analysis reveals differential gene expression and metabolic reprogramming in Coptis teeta Wall. under drought and heat stress. Frontiers in Plant Physiology, 3, Article 1715857. https://doi.org/10.3389/fphgy.2025.1715857

Image Credits: AI Generated

DOI: 10.3389/fphgy.2025.1715857

Keywords: Coptis teeta, transcriptomics, drought stress, heat stress, benzylisoquinoline alkaloids, reactive oxygen species, antioxidant defense, transcription factors, Himalayan medicinal plants, RNA sequencing, climate change, conservation genomics

The experimental design was a full factorial matrix: three compost incorporation rates, zero, twenty, and forty percent by volume, crossed with four sodium chloride concentrations, zero, twenty-five, fifty, and seventy-five millimolar. Every combination was replicated in a controlled soilless culture system, and the plants were measured across an unusually broad biochemical and morphological spectrum. The team tracked plant height, plant diameter, leaf number, leaf length, leaf width, fresh and dry weights of both shoots and roots, root length, and chlorophyll content via SPAD readings. On the biochemical side, they quantified total phenolic content expressed as gallic acid equivalents, total flavonoid content expressed as quercetin equivalents, antioxidant capacity using both DPPH radical scavenging and FRAP ferric reducing assays calibrated against Trolox equivalents, and the activities of three central antioxidant enzymes: superoxide dismutase, catalase, and peroxidase. They also measured malondialdehyde, the classic lipid peroxidation marker, and hydrogen peroxide, the reactive oxygen species that accumulates when cellular defenses falter.

The results paint a clear picture of salinity’s toll. As NaCl concentrations climbed from zero to seventy-five millimolar, plant growth and biomass production declined across the board. Fresh weight, dry weight, leaf dimensions, and root development all contracted under the osmotic and ionic pressure of accumulating sodium. Chlorophyll content dropped as salt disrupted photosynthetic pigment stability. Without any compost amendment, the plants at the highest salinity level showed the steepest losses in every metric the researchers tracked, confirming that even a relatively salt-tolerant ornamental brassica cannot escape the physiological cost of saline root zones in a closed soilless system where there is no soil buffer to dilute the ion load.

Compost changed that trajectory. The twenty percent incorporation rate emerged as the most balanced performer in the entire trial. Plants grown with twenty percent compost maintained growth, chlorophyll content, and antioxidant capacity under saline conditions that would otherwise have suppressed these traits. The mechanism is partly physical and partly chemical: compost improves the water-holding capacity and cation exchange capacity of the growing medium, buffering the root zone against rapid osmotic shifts, while its organic matter and nutrient reserves supply the raw materials plants need to sustain metabolism under stress. The twenty percent rate hit a sweet spot where these benefits outweighed any downsides, allowing the kale to keep building biomass and pigment even as salt concentrations rose around its roots.

The forty percent compost treatment told a more complicated story. On the one hand, it promoted root development and enhanced certain antioxidant responses, suggesting that a richer organic amendment can push the plant’s defensive machinery into higher gear. Root fresh weight and root dry weight benefited from the additional organic matter, and some biochemical indicators of stress tolerance improved. On the other hand, compost carries its own dissolved salts, and at forty percent incorporation the electrical conductivity of the growing medium rose enough to become a liability. Under severe salinity, the higher EC of the forty percent medium compounded rather than relieved the osmotic burden on the roots, limiting plant growth precisely where the twenty percent rate had kept it stable. The lesson is that more compost is not automatically better; the amendment’s own salinity must be accounted for when designing the substrate blend.

Beyond growth, the researchers documented a striking shift in the plants’ phytochemical profile. Compost application increased total phenolic compounds and total flavonoids, the secondary metabolites that serve double duty as antioxidants within the plant and as the compounds that give ornamental kale much of its visual and nutritional character. Antioxidant capacity, measured by both DPPH and FRAP assays, rose in compost-amended plants. The activities of superoxide dismutase, catalase, and peroxidase, the enzymatic front line against reactive oxygen species, were also elevated. Superoxide dismutase converts the superoxide radical into hydrogen peroxide, catalase and peroxidase then break that hydrogen peroxide down into water and oxygen before it can diffuse into cellular compartments and cause damage. Compost-amended plants ran this enzymatic cascade at higher speed, keeping the ROS burden in check.

The oxidative stress markers confirmed the biochemical advantage. Malondialdehyde, which accumulates when salt-stressed membranes undergo lipid peroxidation, and hydrogen peroxide, which builds up when enzymatic scavenging falls behind ROS production, were both reduced in compost-amended plants compared with those grown in unamended peat. Lower MDA means less membrane damage; lower hydrogen peroxide means the enzymatic and non-enzymatic antioxidant systems are keeping pace with the oxidative challenge. Together with the elevated phenolics, flavonoids, and enzyme activities, these reductions indicate that compost does not merely dilute the salt or feed the plant; it actively improves the plant’s oxidative stress tolerance, allowing cells to function closer to normal under conditions that would otherwise push them toward damage and senescence.

The broader context makes these findings more than an academic curiosity. Peat, the dominant substrate in soilless horticulture, is a finite resource whose extraction raises environmental concerns across the industry. Reducing peat dependency is a stated goal of sustainable growing media design, and compost offers a renewable, locally producible alternative that can partially replace peat while simultaneously improving stress resilience. The study’s conclusion that twenty percent compost incorporation represents an effective and sustainable strategy for improving ornamental kale performance under saline conditions while reducing peat dependency ties two threads together: a practical agronomic intervention for salt-affected production and a step toward more circular, less extraction-dependent growing systems. For growers working with saline irrigation water or recycled nutrient solutions, the finding suggests that a modest compost amendment can buy meaningful tolerance without requiring expensive desalination or substrate replacement.

There are, of course, limits to what a single greenhouse trial can establish. The researchers worked with one cultivar, ‘Kamome White’, and one compost source, and the interaction between compost composition and plant response is known to vary with feedstock and processing. The forty percent rate’s elevated electrical conductivity is a reminder that compost quality and salinity must be matched to the crop and the irrigation water. Still, the study’s comprehensive biochemical documentation, spanning growth, pigment, phenolics, flavonoids, antioxidant capacity, enzyme kinetics, and oxidative damage markers, provides a mechanistically grounded case that compost is not just a nutrient supplement but a stress-modulating amendment. For ornamental horticulture, where visual quality is the product and salt stress is an ever-present constraint, that distinction could reshape how growers formulate their substrates.

The research, published open access in BMC Plant Biology on sixteen October 2026, was conducted at the Faculty of Agriculture, Department of Horticulture, Tokat Gaziosmanpaşa University in Türkiye, with Sefa Gün contributing from Ordu University. The authors report no competing interests and no external funding. As soilless cultivation expands and salinity pressures mount in greenhouses and nurseries worldwide, the humble compost heap may prove to be one of the most accessible tools for keeping ornamental crops not just alive but thriving under conditions that would once have been written off as marginal.

Subject of Research: Compost enhances growth, phytochemical characteristics, and antioxidant defense in ornamental kale (Brassica oleracea var. acephala) under salinity stress

Article Title: Compost enhances growth, phytochemical characteristics, and antioxidant defense in ornamental kale (Brassica oleracea var. acephala) under salinity stress

Article References: Alkaç, O. S., Gün, S., & Bayram, N. (2026). Compost enhances growth, phytochemical characteristics, and antioxidant defense in ornamental kale (Brassica oleracea var. acephala) under salinity stress. BMC Plant Biology. https://doi.org/10.1186/s12870-026-10169-6

Image Credits: AI Generated

DOI: 10.1186/s12870-026-10169-6

Keywords: ornamental kale, compost, salinity stress, soilless cultivation, antioxidant defense, phenolic compounds, flavonoids, oxidative stress, Brassica oleracea, horticulture, sustainable substrates, peat reduction

Urban green spaces play a crucial role in mitigating the urban heat island effect, providing shade, improving air quality, and supporting pollinators and other wildlife. But their effectiveness depends heavily on the plants themselves. When temperatures soar, heat-sensitive species can suffer leaf chlorosis, reduced photosynthesis, membrane destabilization, and even death. The review, led by Patricia Duarte de Oliveira Paiva and colleagues at the Federal University of Lavras in Brazil, systematically searched Scopus and Web of Science for studies published between 2016 and 2026, ultimately identifying 25 studies that met strict eligibility criteria. Of these, 21 were rated as high methodological quality, providing a robust evidence base for understanding how ornamental species respond to elevated temperatures.

The review found that heat tolerance in ornamental plants is not the product of a single mechanism but rather the coordinated integration of multiple strategies operating across scales—from visible morphological adjustments to invisible molecular cascades. Heat-tolerant genotypes consistently maintain photosynthetic pigments, membrane stability, and carbon assimilation, while susceptible ones exhibit chlorosis, reduced biomass, and impaired photosynthetic performance. The authors emphasize that thermotolerance depends on the intensity, duration, and frequency of heat exposure, as well as on species- and genotype-specific traits.

At the physiological level, plants deploy a range of cooling and protective strategies. Stomatal regulation helps reduce leaf temperature through transpiration, while some species exhibit paraheliotropism—reorienting leaves vertically to minimize direct solar radiation. Anatomical traits also matter: studies of urban tree species found that evergreens maintained superior water status and lower leaf temperatures during natural heatwaves compared with deciduous species, and that leaf thickness and spongy tissue thickness correlated positively with heat tolerance. In Rhododendron, the heat-tolerant cultivar ‘Lan Yin’ preserved chloroplast integrity and xylem structure, while the sensitive cultivar ‘Liu Qiu Hong’ suffered plasmolysis and chloroplast damage.

Underlying these visible responses is a sophisticated molecular machinery. When temperatures rise, plants activate heat shock transcription factors (HSFs) that bind to heat shock elements in the promoters of heat shock protein (HSP) genes. These molecular chaperones—classified into families such as HSP100, HSP90, HSP70, HSP60, and small HSPs—stabilize and refold denatured proteins, preventing aggregation and facilitating the degradation of irreversibly damaged proteins. In tall fescue (Festuca arundinacea), the small heat shock protein FaHSP17.8-CII was shown to enhance thermotolerance by preserving photosystem II stability and reinforcing heat stress memory. In roses, the transcription factor RhHsfA7 positively regulates heat tolerance by activating heat-responsive genes and enhancing antioxidant capacity.

Calcium signaling plays a central role in heat perception. Heat stress induces a rapid influx of calcium ions through membrane-associated channels, activating calmodulins and calcium-dependent protein kinases (CDPKs) that modulate downstream responses, including the regulation of reactive oxygen species (ROS) homeostasis and abscisic acid (ABA) production. ABA, in turn, promotes stomatal closure to conserve water and activates the expression of heat-responsive genes. Other hormones, including salicylic acid, jasmonates, and brassinosteroids, also participate in the heat stress response, though their roles vary depending on species, tissue, and stress intensity.

Reactive oxygen species occupy a dual role in heat stress biology: they act as signaling molecules that trigger protective responses, but excessive accumulation leads to oxidative damage to lipids, proteins, and DNA. The balance between ROS production and scavenging is a major determinant of thermotolerance. Tolerant plants synthesize antioxidant enzymes—including superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase—as well as non-enzymatic antioxidants such as ascorbate and glutathione. In Rhododendron, the heat-tolerant cultivar ‘Gommer Waterer’ maintained membrane integrity under prolonged heat stress by increasing glutathione peroxidase and glutathione S-transferase activities, while the sensitive cultivar exhibited weaker antioxidant responses and reduced glutathione recycling.

Exogenous compounds offer promising tools for enhancing thermotolerance. Melatonin application alleviated heat stress in tall fescue by promoting growth, protecting photosynthetic pigments, and enhancing antioxidant defenses, while in roses it boosted heat tolerance through modulation of the RhCOMT1 gene. Spermidine, a polyamine, improved heat tolerance in tall fescue by reducing ROS accumulation and maintaining cell membrane stability. Trehalose application and overexpression of the trehalose-6-phosphate synthase gene enhanced heat tolerance in roses by preserving photosynthetic stability and mitigating oxidative damage. However, the authors caution that most of these results were obtained under controlled conditions, and validation in real urban environments remains limited.

Epigenetic mechanisms add another layer of complexity. Heat stress can induce DNA demethylation of heat-responsive genes, histone modifications, and the action of noncoding RNAs, enabling plants to establish a form of stress memory. This ‘thermomemory’ allows plants to respond more rapidly and robustly to recurrent heat events, and in some cases can be transmitted across generations, providing progeny with enhanced resilience to ancestral stress. In tall fescue, transcriptional memory of FaHSP17.8-CII was associated with reduced ROS accumulation and sustained photosystem II activity after heat stress, illustrating how epigenetic regulation translates into physiological protection.

The review highlights significant gaps in current knowledge. Most available studies have focused on a small number of species—particularly tall fescue, a turfgrass frequently used in heat stress research—leaving the responses of many ornamental species used in urban landscapes poorly characterized. Moreover, few studies have examined plant responses under natural urban conditions, where plants face combined stresses including heat, drought, and poor soils. Expanding comparative studies across a wider range of species will be essential for identifying reliable thermotolerance markers that can support breeding programs and the selection of climate-resilient genotypes. Ultimately, the authors argue, integrating these advances into urban landscape planning will contribute to greener, cooler, and more sustainable cities capable of withstanding the heat challenges of the coming decades.

Subject of Research: Physiological and molecular mechanisms of heat stress tolerance in urban ornamental plants

Article Title: Physiological and molecular responses of urban ornamental plants to heat stress

Article References: Paiva, P. D. D. O., Magalhães, H. S., & Paiva, R. (2026). Physiological and molecular responses of urban ornamental plants to heat stress. Frontiers in Horticulture, 5, Article 1923332. https://doi.org/10.3389/fhort.2026.1923332

Image Credits: AI Generated

DOI: 10.3389/fhort.2026.1923332

Keywords: heat stress, ornamental plants, urban green infrastructure, thermotolerance, heat shock proteins, reactive oxygen species, antioxidant defense, epigenetics, climate change, plant hormones, photosystem II, urban heat island

The investigators worked with forty healthy seven-day-old male Shaoxing ducks, a commercially important breed, dividing them into four groups of ten. One group served as untreated controls, one received only Lycium barbarum polysaccharides, or LBPs, at 50 milligrams per kilogram delivered intragastrically, one received cadmium chloride mixed into feed at 50 milligrams per kilogram, and the final group received both. The experiment ran for thirty days under controlled conditions of temperature, humidity, and light. Doses were selected on the basis of previous studies and the team’s own preliminary experiments, and the protocol was approved by the Institutional Animal Care and Use Committee of Yangzhou University.

The consequences of cadmium exposure were quickly apparent. Ducks in the cadmium group lost significant body weight while their kidneys grew heavier relative to body size, a sign of swelling and stress in the organ. Blood chemistry told the same story: levels of creatinine and uric acid, the standard clinical indicators of kidney function, rose sharply. Under the microscope, the damage was striking. Hematoxylin and eosin staining revealed severely disrupted renal architecture, blurred tissue boundaries, atrophied and deformed glomeruli, the kidney’s core filtration units, and hemorrhage in the interstitial spaces. Transmission electron microscopy pushed the view down to the cellular level, exposing nuclear deformation, severe mitochondrial vacuolation, and rupture of the mitochondrial cristae, the folded membranes where cellular energy is produced.

Beneath these visible injuries lay a subtler biochemical sabotage. Using flame atomic absorption spectrometry on digested kidney tissue, the researchers measured the organ’s elemental makeup. Cadmium accumulated dramatically, and as it did, the levels of four essential trace elements, iron, manganese, zinc, and copper, fell. The reason is chemical mimicry. Cadmium shares ionic radius and coordination tendencies with these essential metals, so it can impersonate them in biological systems without performing their functions. The consequences cascade: zinc and copper are components of superoxide dismutase, manganese is the cofactor for the mitochondrial form of that enzyme, and excessive free iron catalyzes the Fenton reaction, generating highly destructive hydroxyl radicals from hydrogen peroxide. Deprived of their raw materials, the antioxidant enzymes falter precisely as the toxic metal floods the system.

The oxidative stress measurements confirmed this collapse. Malondialdehyde, a marker of lipid peroxidation, and hydrogen peroxide rose markedly, while the activities of superoxide dismutase, catalase, and total antioxidant capacity fell, along with the content of glutathione, the cell’s master antioxidant. The team then traced the failure to a master molecular switch. Nrf2 is a transcription factor that, under stress, detaches from its cytoplasmic anchor Keap1, moves into the nucleus, and switches on antioxidant response element-dependent genes. In cadmium-exposed ducks, the protein levels of Nrf2 and its downstream targets, HO-1, NQO1, GCLC, GCLM, and GSR, all dropped. Because GCLC, GCLM, and GSR govern the synthesis and regeneration of glutathione, their suppression crippled the cell’s capacity to manufacture and recycle its most important antioxidant defense.

This is where the wolfberry compound intervened. When ducks received both cadmium and LBP, the pattern reversed. Cadmium burden in the kidney fell, iron, manganese, zinc, and copper levels recovered, the antioxidant enzymes rebounded, and the Nrf2 pathway proteins climbed back toward normal. The researchers attribute the effect to the intrinsic antioxidant, anti-inflammatory, and lipid-lowering properties of LBPs, the major bioactive components of the goji berry, which have been valued in traditional Chinese medicine and are increasingly supported by modern pharmacology. Previous work has shown these polysaccharides acting through multiple signaling pathways with anti-aging, hypoglycemic, immunomodulatory, and neuroprotective effects, and dietary LBP supplementation has already been shown to enhance antioxidant defenses and growth performance in broiler chickens.

But the study’s most novel contribution extends beyond the classic antioxidant story. Cadmium, the team found, triggered a profound disruption of lipid metabolism in the kidney. Total cholesterol and triglyceride levels rose in both serum and kidney tissue, and lipid droplets accumulated visibly under the electron microscope. At the protein level, cadmium upregulated the lipogenic machinery, including FAS, SREBP1, ACC1, ACC2, and PPARγ, the transcription factor that drives adipocyte differentiation and lipid storage. Simultaneously it downregulated the fat-burning side of the ledger: ATGL and HSL, the rate-limiting enzymes that break triglycerides down step by step, along with PPARα, the master regulator of fatty acid oxidation, and CPT2 and LPL, which shuttle fatty acids into mitochondrial beta-oxidation and clear circulating triglyceride-rich lipoproteins respectively. LBP co-treatment corrected both directions of this imbalance, restoring fat breakdown while suppressing excess fat synthesis.

That metabolic rescue rippled into the immune system. The kidney is not merely a filter but an active immune organ, populated by macrophages and T cells that maintain its internal environment. Macrophages polarize into pro-inflammatory M1 cells, marked by iNOS and CD68, or anti-inflammatory M2 cells, marked by Arg1, while T helper cells divide similarly into Th1 and Th2 lineages, tracked by T-bet and GATA3. Cadmium exposure pushed the balance hard toward inflammation: iNOS, CD68, T-bet, and CD4 rose while Arg1 and GATA3 fell, and the inflammatory cytokines IL-18, IL-1β, and TNF-α climbed in kidney tissue. LBP supplementation reversed the polarization markers and substantially lowered all three cytokines. The finding fits into a wider picture in which oxidative stress and disordered lipid metabolism feed chronic inflammation, exhaust immune cells, and ultimately produce immunosuppression, a vicious cycle that the polysaccharide appears to interrupt at multiple points.

The authors are candid about their limits. All results come from phenotypic observations and targeted protein measurements in a live duck model, and without Nrf2 inhibitor or gene-interference experiments the Nrf2 findings indicate correlation rather than proven causality. No transcriptomic or metabolomic analyses were performed, so the global molecular landscape remains unmapped. Even so, the study offers molecular evidence for a natural, widely available feed additive that could protect livestock from heavy metal nephrotoxicity, with implications that reach the human dinner plate, since duck meat and offal enter the food supply chain. As cadmium pollution intensifies with industrialization, a humble berry extract that quiets oxidative stress, restores trace element balance, mends lipid metabolism, and calms inflamed immune tissue is a finding worth watching closely.

Subject of Research: Protective effects of Lycium barbarum polysaccharides against cadmium-induced kidney injury in ducks via the Nrf2 antioxidant pathway

Article Title: Lycium barbarum polysaccharides alleviate cadmium-induced renal injury in ducks by activating the Nrf2-mediated antioxidant defense pathway

Article References: Wang, X., Liu, D., Ma, Y., Zou, H., Tong, X., Zhu, J., Song, R., Zhao, H., & Liu, Z. (2026). Lycium barbarum polysaccharides alleviate cadmium-induced renal injury in ducks by activating the Nrf2-mediated antioxidant defense pathway. Frontiers in Veterinary Science, 13, Article 1998071. https://doi.org/10.3389/fvets.2026.1998071

Image Credits: AI Generated

DOI: 10.3389/fvets.2026.1998071

Keywords: cadmium, nephrotoxicity, Lycium barbarum polysaccharides, Nrf2, oxidative stress, ducks, lipid metabolism, kidney injury, trace elements, antioxidant defense, immune balance, wolfberry

A new study published in Frontiers in Animal Science offers compelling evidence that green tea extract, a polyphenol-rich supplement derived from dried Camellia sinensis leaves, may serve as exactly that alternative. The research, led by Tunde E. Ogundare and colleagues at North Carolina A&T State University in collaboration with North Carolina State University, investigated how varying dietary concentrations of green tea extract modulate growth performance, C. perfringens colonization, intestinal health, and oxidative status in broiler chickens during a necrotic enteritis challenge. The findings suggest that supplementation at up to 500 mg/kg can mitigate the characteristic growth depression, reduce intestinal damage, and enhance the host antioxidant defense in affected birds.

The experimental design was rigorous. A total of 600 one-day-old Ross 708 male broiler chicks were randomly allocated to six dietary treatment groups, each replicated five times with 20 birds per replicate in a completely randomized design. The treatments included an unchallenged negative control receiving a corn-soybean meal basal diet without additives; a necrotic enteritis-challenged positive control on the same basal diet; an antibiotic-supplemented group receiving 55 mg/kg bacitracin methylene disalicylate alongside the challenge; and three green tea extract groups supplemented at 250, 500, or 1000 mg/kg, all subjected to the same challenge. Except for the negative control, all groups received a 10× dose coccidiosis vaccine containing live oocysts of Eimeria acervulina, Eimeria maxima, and Eimeria tenella on day 13, followed by oral gavage with 3.2 × 10⁸ colony-forming units per milliliter of C. perfringens on days 18 and 19. This dual-hit model, combining coccidia-induced epithelial damage with C. perfringens overgrowth, reliably reproduces the multifactorial pathogenesis of necrotic enteritis in commercial settings.

The green tea extract used was produced through methanolic extraction of dried tea leaves and obtained from Sabinsa Corporation. Liquid chromatography-mass spectrometry analysis confirmed a rich catechin profile, with epigallocatechin gallate (EGCG) as the most abundant constituent at 70,028.73 µg/g, followed by epicatechin gallate at 36,437.07 µg/g and epigallocatechin at 33,193.41 µg/g. EGCG is recognized as the most biologically active catechin, contributing significantly to the robust antioxidant properties of green tea. The researchers verified that polyphenol concentrations increased proportionally in all supplemented diets, with EGCG and epicatechin gallate emerging as the major polyphenol constituents across starter and grower rations.

By the end of the 28-day feeding trial, the necrotic enteritis challenge had taken a measurable toll. Challenged birds without any dietary intervention exhibited significantly reduced average body weight and weight gain compared to the unchallenged control, along with a markedly poorer feed conversion ratio. However, green tea extract supplementation at 250 mg/kg tended to produce the highest body weight and weight gain among all challenged treatments, while all green tea extract groups and the antibiotic group showed improved feed conversion ratios relative to the challenged control. Feed intake did not differ significantly across treatments, indicating that the performance benefits arose from improved intestinal function rather than increased consumption.

Intestinal lesion scoring revealed the extent of mucosal damage during peak infection on day 20. The challenged control group showed severe lesions across the duodenum, jejunum, and ileum, with scores approaching the maximum on the 0-to-6 scale. In contrast, all supplemented groups, whether receiving the antibiotic or green tea extract at any concentration, showed significantly lower lesion scores in all three intestinal segments. By day 26, as the disease progressed into its later phase, the 500 and 1000 mg/kg green tea extract groups maintained significantly lower lesion scores across all segments compared to the challenged control, while the 250 mg/kg group showed significant reductions in the jejunum and ileum. C. perfringens colonization in the ileo-jejunal segment was significantly higher in all challenged treatments than in the unchallenged control during peak infection, though the 1000 mg/kg green tea extract group showed the lowest colonization among challenged groups at that time point. By day 26, the antibiotic group significantly lowered intestinal C. perfringens counts relative to the challenged control, with the 250 mg/kg green tea extract group showing a similar tendency.

Jejunal histomorphometry on day 20 provided structural evidence of the protective effects. The challenge significantly reduced villus height in the untreated challenged group, a hallmark of necrotic enteritis that impairs nutrient absorptive capacity. All supplemented groups tended to improve villus height relative to the challenged control, with the 1000 mg/kg group reaching 610.77 µm compared to 388.85 µm in the challenged control. The villus height-to-crypt depth ratio, a key indicator of intestinal integrity and absorptive function, was similarly depressed in the challenged control but tended to recover in all supplemented groups. Goblet cell density, which reflects the population of mucus-secreting cells critical for maintaining the protective mucus layer over the epithelium, was significantly lowest in the challenged control. The 500 mg/kg green tea extract group showed the highest goblet cell density of all treatments at 698.07 cells per square millimeter, suggesting enhanced mucosal barrier maintenance. Conversely, intraepithelial leukocyte density, a marker of mucosal inflammation and cytotoxic immune activity within the epithelial layer, was significantly highest in the challenged control and significantly lowest in the 500 mg/kg green tea extract group.

The molecular analysis focused on select antioxidant and mucin genes measured by quantitative real-time PCR. The mRNA abundance of catalase (CAT), superoxide dismutase 1 (SOD1), and nuclear factor erythroid 2–related factor 2 (NRF2) were generally lower in the challenged control compared to the unchallenged control during peak infection, reflecting a compromised antioxidant defense system. Green tea extract treatments showed a tendency to increase CAT expression relative to the challenged control on day 20, while the 500 and 1000 mg/kg groups demonstrated significantly higher SOD1 expression at both sampling time points. NRF2, the central transcription factor that orchestrates the expression of cytoprotective genes including SOD1 and CAT in response to oxidative stress, was significantly higher in all green tea extract groups compared to the challenged control during peak infection. Mucin 2 (MUC2) gene expression was generally lower in all challenged treatments, mirroring the severity of intestinal C. perfringens colonization, though the 1000 mg/kg group showed a tendency toward increased MUC2 expression by day 26.

Serum nitric oxide concentrations, measured using the Griess reagent system, provided a systemic readout of the oxidative and nitrosative stress burden. The challenged control group exhibited significantly elevated serum nitric oxide compared to all other treatments on both day 20 and day 26, consistent with dysregulated inducible nitric oxide synthase activity and excessive nitrosative stress during the disease. In contrast, birds receiving either the antibiotic or green tea extract supplementation showed reduced serum nitric oxide levels, indicating that the polyphenol-rich supplement helped restore redox balance and limit the reactive nitrogen species that can react with cellular components and promote tissue damage.

Collectively, these findings highlight the potential of green tea extract as a promising natural antioxidant and viable alternative to in-feed antibiotics for mitigating the effects of necrotic enteritis in poultry. The researchers suggest that supplementation at up to 500 mg/kg of broiler diet can mitigate intestinal damage and enhance gut health in affected birds by modulating the host oxidative status through the NRF2 signaling pathway and associated antioxidant genes. The dual antimicrobial and antioxidant activities of the catechins, particularly EGCG, appear to work in concert to reduce pathogen proliferation, protect epithelial integrity, and strengthen the enzymatic antioxidant defense. Future studies assaying antioxidant enzyme activities directly in chicks fed green tea extract during necrotic enteritis could further establish the full scope of the supplement’s effects on oxidative status, but the current evidence positions this polyphenol-rich extract as a compelling candidate for antibiotic-free poultry production systems grappling with one of the industry’s most persistent enteric challenges.

Subject of Research: Animal Science

Article Title: Modulation of intestinal health and oxidative status by dietary green tea extract in broilers chickens challenged with necrotic enteritis

Article References: Ogundare, T. E., Kulkarni, R. R., Apalowo, O. O., Wang, W., Sang, S., & Fasina, Y. O. (2026). Modulation of intestinal health and oxidative status by dietary green tea extract in broilers chickens challenged with necrotic enteritis. Frontiers in Animal Science, 7, Article 1975012. https://doi.org/10.3389/fanim.2026.1975012

Image Credits: AI Generated

DOI: 10.3389/fanim.2026.1975012

Keywords: green tea extract, necrotic enteritis, Clostridium perfringens, broiler chickens, antioxidant defense, poultry health, Nrf2 pathway, antibiotic alternatives, Modulation, intestinal, health, oxidative

The study, published in BMC Plant Biology, focused on Bacillus safensis strain H23, a member of the plant growth-promoting rhizobacteria, a loose federation of root-colonizing microbes known to boost plant health. Led by Aliya Ayaz and corresponding author Huizhen Fu of Hainan University, with collaborators at Guangxi University, the team set out to answer a question that has long frustrated plant pathologists: what, at the molecular level, does a protective bacterium actually do inside a plant under attack? Biological control agents like Bacillus are widely used, but the transcriptional choreography they induce in the host has remained largely opaque, particularly for bacterial wilt, whose molecular basis of biocontrol the authors describe as poorly understood.

The experimental design was straightforward in concept but demanding in execution. The researchers grew tomato plants under different conditions: uninfected controls, plants infected with Ralstonia pseudosolanacearum, plants treated with the H23 bacterium, and plants that received both the protector and the pathogen. They then measured disease symptoms and a battery of physiological indicators, and harvested tissue at two time points, five and ten days into the interaction, to capture both the early and later phases of the plant’s response. RNA sequencing of these samples allowed the team to track how thousands of genes changed their activity across every treatment comparison.

The physiological results were unambiguous. Plants pretreated with H23 showed significantly reduced disease severity and better growth under pathogen pressure. The protective bacterium also enhanced the activity of the plant’s antioxidant enzymes, the first line of defense against the reactive oxygen molecules that both pathogens and stressed plant cells generate. Critically, H23 alleviated oxidative damage in measurable ways: levels of malondialdehyde, a marker of lipid damage in cell membranes, dropped, as did the accumulation of hydrogen peroxide and the leakage of electrolytes, which signals that membranes have lost their integrity. In short, the bacterium helped the plant keep its cellular machinery intact while the pathogen raged.

The transcriptomic data revealed the sheer scale of the underlying reprogramming. Across all treatment comparisons, the researchers identified 11,788 differentially expressed genes at the five-day time point and 11,674 at ten days, numbers indicating that the plant-microbe interaction triggers an extensive and sustained overhaul of the tomato genome’s activity rather than a brief defensive flare. Gene ontology and KEGG pathway enrichment analyses then showed that the two microbes pushed the plant in strikingly different directions. Treatment with H23 primarily induced genes involved in cell wall organization, polysaccharide metabolism, phenylpropanoid biosynthesis, MAPK signaling, and plant hormone signaling pathways. Infection with Ralstonia, by contrast, mainly activated oxidative stress responses, glutathione metabolism, and defense-related signaling.

That contrast is scientifically telling. The H23 profile suggests a bacterium that prepares the plant structurally and systemically: reinforcing cell walls, ramping up phenylpropanoid biosynthesis, which produces lignin and other defensive compounds, and priming hormone signaling networks that coordinate immune responses. The pathogen profile, meanwhile, reads like the signature of a plant under oxidative siege, scrambling to neutralize reactive oxygen species through glutathione metabolism and to mount whatever defense signaling it can. The implication is that H23 does not simply fight the pathogen directly; it shifts the plant into a state of induced systemic resistance, a primed defensive posture in which the plant’s own architecture and signaling systems are fortified before and during attack.

To make sense of more than eleven thousand changing genes, the team turned to Weighted Gene Co-expression Network Analysis, or WGCNA, a statistical framework that groups genes into modules based on how their expression patterns correlate across samples. The analysis identified five key modules whose activity was associated with the physiological traits the researchers had measured. Within these modules, the team pinpointed 150 hub genes, the most highly connected and presumably most influential members of each co-expression cluster. These hub genes were associated with disease resistance, oxidative stress regulation, detoxification, hormone signaling, and secondary metabolism, painting a coherent picture of the biological processes that matter most in the protected plants.

The final and perhaps most novel step was the application of machine learning. Rather than relying on enrichment statistics alone, the researchers fed their candidate gene data into machine-learning algorithms to prioritize the genes most strongly associated with pathogen response and with H23-mediated regulation. The analysis converged on ten key candidate genes, a compact set that the authors propose as core molecular markers of the protective interaction. This combination of network analysis and machine learning reflects a broader trend in plant biology: as sequencing datasets balloon, computational triage has become essential for distinguishing the handful of genes that truly drive a phenotype from the thousands that merely change along the way.

The practical implications extend in two directions. For breeders, the ten candidate genes offer concrete targets: markers that could be tracked in breeding programs aimed at tomato varieties with stronger innate resistance to bacterial wilt, whether through conventional selection or genome editing. For agronomists and integrated pest management specialists, the study strengthens the case for PGPR-based biocontrol as a component of integrated disease management, providing a molecular rationale for what has often been an empirically observed benefit. Because the protective effect operates through the plant’s own antioxidant defenses, structural reinforcement, and immune signaling, it complements rather than duplicates existing control measures, and it may reduce dependence on chemical treatments that struggle against a root-dwelling, vascular pathogen.

The research, supported by funding from Hainan Province and Hainan University, also carries the usual caveats of early-stage translational science. The candidate genes were identified through association and prioritization, and confirming their function will require direct genetic validation in tomato. Field performance of H23 across diverse soils, climates, and pathogen strains remains to be demonstrated. Yet the study’s framework, pairing physiological measurement with time-resolved transcriptomics, co-expression networks, and machine learning, offers a template that can be applied to other beneficial microbes and other crops. For a disease as destructive and intractable as bacterial wilt, a molecular map of how a harmless soil bacterium teaches a tomato plant to defend itself is a meaningful step toward crops that can stand firm where they once collapsed.

Subject of Research: Bacillus safensis-mediated induction of tomato resistance to Ralstonia bacterial wilt revealed by transcriptomics and machine learning

Article Title: Integrated transcriptomics and machine learning reveal core genes associated with Bacillus safensis-mediated resistance to tomato bacterial wilt

Article References: Ayaz, A., Ikram, M., Jin, R., Gao, F., Yu, W., Wang, Z., Liu, P., Huang, J., & Fu, H. (2026). Integrated transcriptomics and machine learning reveal core genes associated with Bacillus safensis-mediated resistance to tomato bacterial wilt. BMC Plant Biology. https://doi.org/10.1186/s12870-026-10116-5

Image Credits: AI Generated

DOI: 10.1186/s12870-026-10116-5

Keywords: tomato, bacterial wilt, Bacillus safensis, Ralstonia pseudosolanacearum, PGPR, transcriptomics, differentially expressed genes, WGCNA, machine learning, plant immunity, biological control, antioxidant defense

The problem the researchers set out to tackle is more insidious than either stress alone. Salinity does not simply dehydrate plants; it also changes soil chemistry in ways that make heavy metals more mobile and more available for uptake. Earlier work cited by the team, including studies on cadmium mobility in saline soils, has shown that sodium salts can displace metal ions from soil particles, releasing them into the soil solution where roots readily absorb them. In the experimental soil used in this study, which had an electrical conductivity of 9.06 decisiemens per meter, wheat plants accumulated substantially more sodium, copper, lead and cadmium than plants grown under normal conditions.

The consequences for the plants were severe. Across two growing seasons, salinity combined with heavy metal contamination raised leaf sodium concentrations by roughly 50 to 53 percent, while leaf contents of copper rose by about 24 percent, lead by 66 to 87 percent and cadmium by 36 to 41 percent. The contaminated plants also accumulated more nitrate and nitrite, compounds that are undesirable in grain destined for human consumption. The physiological toll was reflected in the harvest: straw yields fell by about 30 to 35 percent and grain yields by nearly 32 percent compared with unstressed controls.

At the biochemical level, the stressed plants were fighting a losing battle against reactive oxygen species. Salinity and heavy metals both trigger the overproduction of these destructive molecules, which damage membranes, proteins and DNA. The plants responded by ramping up their enzymatic antioxidant defenses—superoxide dismutase, catalase and guaiacol peroxidase—and by elevating their pools of glutathione, a tripeptide that sits at the heart of the cellular redox system. Yet protein content declined, and the levels of essential macronutrients such as nitrogen, phosphorus and calcium, along with micronutrients including iron, manganese and zinc, all dropped. The plants were essentially starving while simultaneously being poisoned.

The intervention tested by the team was elegantly simple. Seeds were primed in either water, a 3 percent moringa leaf extract, a 1 millimolar glutathione solution, or a combination, and the same solutions were then applied as foliar sprays as the plants developed. Moringa oleifera, often called the miracle tree, is rich in antioxidants, vitamins, minerals and growth-promoting substances, and its leaf extract has previously been shown to alleviate salt and cadmium stress in several crops. Glutathione, meanwhile, is the plant’s own master antioxidant, participating directly in the detoxification of reactive oxygen species and in the chelation and sequestration of heavy metals.

The results of the sequenced application were striking. Plants that received both moringa leaf extract and glutathione, as seed priming followed by foliar spray, showed increases in superoxide dismutase activity of roughly 45 to 49 percent and in guaiacol peroxidase activity of 51 to 56 percent compared with stressed, untreated plants. Total protein content climbed by about 32 to 33 percent, and glutathione levels themselves surged by 60 to 70 percent, suggesting that the treatment primed the plants’ internal antioxidant machinery rather than merely supplementing it from outside.

Just as importantly, the treatment restored nutritional balance. Leaf concentrations of nitrogen rose by 28 to 51 percent, phosphorus by nearly 48 to 50 percent, potassium by 20 to 26 percent and calcium by 33 to 53 percent. Micronutrients followed the same pattern: leaf iron increased by 33 to 51 percent, zinc by 48 to 54 percent and manganese by about 36 percent, with similarly large gains in the grain. Because iron, zinc and manganese deficiencies affect billions of people worldwide, the finding that this treatment can biofortify wheat grain while detoxifying it is among the most consequential aspects of the work.

At the same time, the toxic load in the plants fell sharply. Leaf cadmium declined by 47 to 50 percent and lead by 48 to 49 percent, while grain cadmium dropped by 29 to 30 percent, lead by 47 to 54 percent and copper by about 26 percent. Leaf sodium, the principal driver of salt toxicity, fell by 40 to 45 percent, and grain nitrate and nitrite contents decreased by 47 to 54 percent and 54 to 61 percent respectively. The combined effect was a substantial recovery in productivity, with treated plants producing markedly higher straw and grain yields than their untreated, stressed counterparts.

The mechanism, as the authors describe it, is a coordinated restoration of homeostasis. By boosting the antioxidant defense system, the treatment limits the oxidative damage that heavy metals and sodium inflict on cells. By improving nutrient uptake, it counteracts the competitive interference that sodium causes with potassium, calcium and other essential elements. And by reducing the accumulation of toxic ions, it frees the plant’s metabolic resources for growth and grain filling rather than repair. The sequenced approach—priming seeds to establish defenses early, then reinforcing them with foliar sprays during critical growth stages—appears to be key, consistent with the team’s earlier work showing that sequenced glutathione and biostimulant applications improve wheat’s adaptation to salinity.

For agriculture in arid and semi-arid regions, where saline and contaminated soils are spreading, the implications are considerable. Both moringa leaf extract and glutathione are inexpensive, environmentally benign and easy to apply, making the strategy accessible to smallholder farmers who cannot afford soil remediation or expensive genetic solutions. The study, funded by the Deanship of Scientific Research at King Abdulaziz University, demonstrates that crop protection on degraded land need not begin in the soil itself; it can begin in the seed and the leaf. If field-scale trials confirm these two-season results, a tree extract and a common cellular antioxidant could become standard tools for growing safer, more nutritious wheat on some of the world’s most compromised farmland.

Subject of Research: Alleviation of combined salinity and heavy metal stress in wheat using moringa leaf extract and glutathione

Article Title: Glutathione and moringa leaf extract improve wheat tolerance to heavy metal-contaminated saline soil by regulation of antioxidant defense system and nutrient balance

Article References: Alamri, A. M., Rehman, H. U., Khalid, F., Alharby, H. F., Majrashi, A., Abdulmajeed, A. M., & Rady, M. M. (2026). Glutathione and moringa leaf extract improve wheat tolerance to heavy metal-contaminated saline soil by regulation of antioxidant defense system and nutrient balance. Plant Cell Reports, 45(11), Article 329. https://doi.org/10.1007/s00299-026-04010-5

Image Credits: AI Generated

DOI: 10.1007/s00299-026-04010-5

Keywords: wheat, salinity stress, heavy metals, glutathione, moringa leaf extract, antioxidant defense, seed priming, foliar spray, nutrient balance, grain quality, cadmium, soil contamination