GolS enzymes catalyze the first committed step in the biosynthesis of raffinose family oligosaccharides, a group of sugars long associated with protecting plant cells against dehydration, heat damage, and oxidative stress. Because the first step of a metabolic pathway is often its principal control point, the genes encoding galactinol synthase effectively act as gatekeepers for the entire protective sugar-production pipeline. Although GolS families had been characterized in several other plant species, a comprehensive, genome-scale portrait of the family in soybean had been missing. The new study fills that gap, and its findings point to specific family members that could become targets for breeding stress-resilient soybean varieties.

The team began with a systematic search of the soybean genome and identified 25 GmGolS genes, encoding proteins ranging from 328 to 644 amino acids in length. That is a substantial repertoire, and its size reflects a history of duplication. Mapping the genes onto the chromosomes revealed an uneven distribution across 11 of soybean’s 20 chromosomes, with chromosomes 3 and 19 carrying the highest density of family members. This kind of patchy genomic geography is a classic signature of gene family expansion through duplication followed by divergence, rather than a uniform scattering of newly minted genes.

To understand where the 25 soybean proteins came from, the researchers built phylogenetic trees that included GolS orthologs from Arabidopsis thaliana, the standard reference plant of molecular genetics, and rice, a monocot that diverged from soybean’s lineage deep in evolutionary time. All of the GolS proteins resolved into six groups, and within each group the soybean members showed structural conservation that suggests shared functional ancestry. In other words, proteins that cluster together on the tree likely retain similar biochemical jobs, giving researchers a practical shortcut for guessing which of the 25 genes deserve priority attention.

Synteny analysis, which tracks blocks of genes that are duplicated wholesale between chromosomes, indicated that segmental duplication was the predominant engine of family expansion in soybean, with tandem clusters on chromosomes 4 and 5 providing an additional contribution. By estimating the divergence of duplicate gene pairs, the team dated these duplication events to a window stretching from roughly 0.20 to 112.87 million years ago, spanning everything from recent soybean-specific duplications to events that predate the split of major plant lineages. The ratio of nonsynonymous to synonymous substitution rates, the Ka/Ks statistic, came out predominantly below 1 for the duplicate pairs, a mathematical indication that purifying selection has been quietly pruning harmful mutations from this family ever since the copies were born. Evolution, in short, has kept these genes working rather than letting them decay into pseudogene fossils.

The structural biology side of the study added further depth. Subcellular localization predictions placed different GmGolS proteins in the chloroplasts, the cytoplasm, and the plasma membrane, hinting that raffinose family oligosaccharide synthesis may operate in multiple cellular compartments rather than at a single address. Protein-protein interaction network analysis connected the GmGolS proteins to partners involved in carbohydrate metabolism and stress responses, embedding the family in the broader cellular machinery that reallocates carbon and protects membranes under duress. Homology modeling showed that the proteins carry a conserved GT8 fold, the glycosyltransferase architecture required to transfer galactose onto myo-inositol to make galactinol itself, consistent with the catalytic demands of the reaction.

The most immediately striking results, however, came from the expression experiments. The researchers grew seedlings of three soybean cultivars and subjected them to drought, heat, and the combined stress of both at once, then measured GmGolS transcript levels by reverse-transcription quantitative PCR. The family did not respond as a single bloc. Instead, individual genes displayed variable, stress-specific patterns, and the combined treatment elicited the strongest transcriptional response overall. That observation matters because combined heat and drought is precisely the scenario climate models project for many soybean-growing regions, and it is also the scenario most laboratory studies neglect.

Within that chorus of responses, five genes stood out for comparatively high expression across treatments: GmGolS-3, GmGolS-9, GmGolS-10, GmGolS-13, and GmGolS-17. Two of them, GmGolS-3 and GmGolS-9, were most strongly induced under combined stress, making them the family’s standout responders to the harshest condition tested. By contrast, GmGolS-11 responded primarily to heat stress alone, suggesting a specialized thermal role, while GmGolS-13 was consistently downregulated across all treatments, an intriguing counterpoint that implies functional divergence within the family rather than uniform activation. The authors are careful to note that these expression signatures identify candidates, not proven functions; functional validation, through knockout, overexpression, or gene-editing experiments, will be required to confirm the precise biological role of each member.

Why does this matter beyond the soybean field? Raffinose family oligosaccharides do more than shield cells from stress; they also accumulate in seeds, where they influence desiccation tolerance during maturation and, controversially, the nutritional profile of animal and human diets, since monogastric animals digest them poorly. A family of 25 genes with compartment-diverse members and stress-tuned regulation therefore touches agronomy, seed biology, and food quality simultaneously. The evolutionary picture assembled here, with purifying selection preserving duplicated copies over tens of millions of years, suggests that the cell has strong reasons to maintain multiple versions of this enzymatic gatekeeper, likely because different copies serve different tissues, compartments, or environmental triggers.

For breeders and biotechnologists, the study delivers a practical shortlist. GmGolS-3 and GmGolS-9, as the strongest responders to combined drought and heat, are the obvious first candidates for functional characterization and for marker-assisted selection programs seeking varieties that hold their yield when the weather turns hostile. The genome-wide map of the family, its duplication history, its chromosomal addresses, and its stress-responsive expression patterns together provide the foundation that previous work lacked. As heatwaves and dry spells increasingly arrive hand in hand, understanding how soybean mobilizes its sugar-based defenses, gene by gene, is no longer a niche question of plant metabolism. It is a blueprint for keeping one of the world’s staple crops productive in the climates of the coming decades.

Subject of Research: Genome-wide characterization of the soybean galactinol synthase gene family and its expression under drought, heat, and combined stress

Article Title: Genome-wide identification and characterization of the galactinol synthase (GmGolS) gene family and its expression under drought, heat, and combined stress in soybean

Article References: Lamlom, S. F., Ibrahim, N. S., Radwan, N. S., & Abdelsalam, N. R. (2026). Genome-wide identification and characterization of the galactinol synthase (GmGolS) gene family and its expression under drought, heat, and combined stress in soybean. BMC Plant Biology. https://doi.org/10.1186/s12870-026-09943-3

Image Credits: AI Generated

DOI: 10.1186/s12870-026-09943-3

Keywords: soybean, galactinol synthase, GmGolS, raffinose family oligosaccharides, drought stress, heat stress, combined stress, gene duplication, phylogenetic analysis, RT-qPCR, abiotic stress tolerance, BMC Plant Biology

The problem that clean gene technology addresses traces back to the first generation of transgenic crops. Traditional genetic modification relies on selectable marker genes, typically conferring antibiotic or herbicide resistance, to identify the rare plant cells that successfully incorporated new DNA during laboratory transformation. These markers were indispensable tools, but their continued presence in commercial products fueled public apprehension and complex regulatory debates. Concerns about the potential horizontal transfer of resistance genes to microorganisms, allergenicity, and broader environmental impacts, even where scientific evidence of harm remains limited, have profoundly shaped public skepticism and imposed stringent regulatory standards on genetically modified crops worldwide.

Clean gene technology, also called marker-free transformation, emerged as a direct response. Its central principle is deceptively simple: the final plant should contain only the desired trait gene, free from any extraneous DNA such as marker genes or vector backbone sequences. The result is a crop that is genetically indistinguishable from one produced by conventional breeding, apart from the specific beneficial trait that has been introduced or edited. According to the review, led by Neha Jamwal of Dr. Y.S. Parmar University of Horticulture and Forestry in India and colleagues, this commitment to precision and biological containment could ease biosafety concerns, streamline regulatory approval, and foster greater public trust in genetically improved vegetables.

The review outlines several major strategies for achieving marker-free outcomes. Co-transformation uses two separate DNA plasmids, one carrying the gene of interest and the other carrying the selectable marker. Because the two insertions integrate at different genomic locations, they segregate independently according to Mendelian principles, allowing breeders to screen subsequent generations for progeny that inherited the trait gene but not the marker. The approach has been applied successfully in cabbage and tomato. In rapeseed, researchers used Agrobacterium to deliver two distinct T-DNAs and recovered plants carrying solely the target gene, demonstrating the method’s efficacy.

Site-specific recombination systems offer a second route. Enzymes such as Cre or FLP recognize specific DNA sequences, loxP or FRT sites respectively, that flank the selectable marker. Once transformation and selection are complete, the recombinase gene, often controlled by a tissue-specific, heat-inducible, or chemically inducible promoter, is activated and excises the marker. The recombinase machinery itself can then be segregated away in later generations or auto-excised. A third strategy exploits transposons, mobile genetic elements engineered to carry the marker gene, which can jump out of the genome after selection, leaving only the gene of interest behind. The maize-derived Ac/Ds system has been used for this purpose in vegetables including lettuce.

The most radical option, and the one driving much of the field’s current momentum, is targeted genome editing with CRISPR-Cas9, TALENs, and zinc-finger nucleases. Rather than inserting foreign DNA at random, these tools modify, delete, or insert sequences at predetermined genomic locations. Subtle edits such as single nucleotide changes made by base or prime editing may require no marker at all, since edited cells can be identified by molecular detection. When a temporary marker is needed, the editing machinery itself can excise it afterward. Delivering CRISPR reagents as transient ribonucleoprotein complexes, or segregating out the Cas9 and guide RNA transgenes in the next generation, produces plants carrying the desired edit with no residual editing apparatus, sometimes within a single generation.

The applications across vegetable crops are already substantial. In tomato, CRISPR has been used to edit host susceptibility genes of the eIF4E family to confer resistance against tomato yellow leaf curl virus, while in cucumber, editing eIF4E delivered broad-spectrum resistance to potyviruses by disrupting the interaction through which the viral VPg protein hijacks the plant’s translation machinery. For potato late blight, caused by Phytophthora infestans, clean gene approaches include Cre-loxP mediated marker excision after introducing resistance genes from wild relatives, and CRISPR-directed cisgenic insertion of native resistance genes into safe-harbor loci. The pepper Bs4 gene, wait, the Bs2 gene encoding bacterial spot resistance, was transferred into tomato on a marker-free vector, demonstrating durable field-level disease control. In eggplant, transposon-mediated excision and CRISPR-guided RNA interference constructs offer marker-free routes to resistance against the fruit and shoot borer, a devastating pest traditionally managed with Bt transgenes.

Abiotic stress tolerance and nutritional quality represent equally promising frontiers. Editing transcription factors such as CsNAC and CsDREB has improved drought tolerance in cucumber by enhancing water retention and reducing wilting. In tomato, mutagenesis of the SIMAPK3 gene modified stress signaling pathways to increase resilience under water scarcity and salinity, while earlier work on CBF1 overexpression improved chilling tolerance. Biofortification efforts are advancing as well: CRISPR editing of native carotenoid pathway genes in carrot could raise beta-carotene levels without introducing foreign genes, and editing ZIP, NRAMP, ferritin, and YSL transporter genes in spinach and legumes offers a marker-free strategy for boosting iron and zinc to combat hidden hunger. On the quality side, precise knockout of polyphenol oxidase and asparagine synthetase genes underpins commercially developed non-browning potatoes, and CRISPR editing of ripening genes such as RIN, CNR, and NOR extends tomato shelf life. Editing the SlAGO7 gene increased tomato lycopene content by 300 percent, and Japan’s GABA-enriched tomato, along with a vitamin D-enriched tomato developed in the United Kingdom, mark milestones for gene-edited vegetables reaching consumers.

The regulatory and social implications may prove as consequential as the science. Because clean gene products lack antibiotic resistance markers and unnecessary foreign DNA, they are perceived as safer and more natural, potentially reducing biosafety scrutiny. In the United States, Japan, and Argentina, transgene-free genome-edited crops are increasingly regulated in alignment with conventional breeding rather than under GMO frameworks, an alignment the review identifies as a key imperative for faster commercialization. Nevertheless, significant hurdles remain. Achieving fully marker-free plants can be labor-intensive and requires extensive progeny screening; regulatory harmonization is incomplete, with some jurisdictions still classifying even marker-free edits as GMOs; gene-editing technologies remain costly and expertise-dependent, limiting access for smaller institutions and developing countries; off-target effects demand rigorous validation; public skepticism persists despite the clean label; and the patent landscape for editing tools is complex.

The authors conclude that clean gene technology has matured from an idealistic concept into a practical toolkit redefining vegetable crop improvement. By combining high-precision CRISPR systems with optimized transformation protocols and integration with conventional breeding, the field aims to accelerate the development of nutrient-enriched, climate-resilient, and high-yielding varieties. Research is also shifting toward traits that directly benefit consumers, such as flavor, shelf life, and nutrition, which may further drive acceptance. With supportive regulatory structures and transparent public engagement, the review argues, clean gene technology could play a central role in delivering a sustainable, productive, and nutritious vegetable supply for a changing world.

Subject of Research: Marker-free genetic engineering and CRISPR-based clean gene technology for improving vegetable crop traits

Article Title: Clean gene technology for precision breeding and genetic improvement of vegetable crops

Article References: Jamwal, N., Singathiya, P., Pandey, S., Mahala, P., Kumari, R., Uikey, P., Rajak, J., Sohi, A., Choudhary, R., Faruk, M., Nazir, N., & Yadav, L. P. (2026). Clean gene technology for precision breeding and genetic improvement of vegetable crops. Discover Plants, 3(1), Article 431. https://doi.org/10.1007/s44372-026-00907-3

Image Credits: AI Generated

DOI: 10.1007/s44372-026-00907-3

Keywords: clean gene technology, marker-free transformation, CRISPR-Cas9, selectable marker genes, vegetable crops, genome editing, precision breeding, disease resistance, biofortification, abiotic stress tolerance, cisgenesis, plant biotechnology

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

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

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

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

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

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

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

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

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

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

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

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

Image Credits: AI Generated

DOI: 10.1007/s10123-026-00897-y

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

The team began by charting where and when VvbHLH10 switches on. Under laboratory conditions, its transcription was rapidly and strongly induced by both salt and alkali treatments, a pattern consistent with a gene recruited into the front line of the stress response. Intriguingly, the gene is also predominantly expressed in actively growing tissues, including latent buds, young stems and young tendrils, placing it at the intersection of stress defense and development. Using a VvbHLH10-GFP fusion protein, the researchers confirmed that the protein localizes to the nucleus, the expected working address for a transcription factor that binds promoter regions and orchestrates the expression of downstream target genes.

To test function rather than mere correlation, the researchers deployed two complementary experimental systems. The first was homologous overexpression in grape callus cultures, an in vitro system derived from the plant itself. When grape calli engineered to overexpress VvbHLH10 were challenged with salt and alkali stress, they survived and grew significantly better than control calli. Biochemical assays pointed to the mechanism behind that resilience: the engineered tissues accumulated markedly lower levels of reactive oxygen species (ROS) and malondialdehyde (MDA), two classic signatures of oxidative damage. Because salt and alkali stress disrupt photosynthesis and electron transport, plants typically respond with bursts of ROS that damage membranes, proteins and DNA; reducing that oxidative burden is a central goal of stress-resilience breeding.

The second system took the gene out of grapes altogether. In a heterologous expression approach, the team introduced VvbHLH10 into tomato, a widely used surrogate that allows plant scientists to ask whether a gene’s function is conserved across species. The answer was a clear yes. Transgenic tomato lines overexpressing VvbHLH10 showed markedly improved tolerance to salt-alkali treatment compared with wild-type controls, again with reduced oxidative damage and better overall growth. Cross-species validation of this kind matters for breeders because it suggests the underlying regulatory module is not a grape-specific quirk but a portable stress-protection circuit that could, in principle, be engineered into other horticultural crops facing the same soil chemistry problems.

Then came the surprise. Beyond its protective function, ectopic expression of VvbHLH10 in tomato promoted axillary bud outgrowth and altered the plants’ vegetative architecture. Axillary buds are the embryonic shoots that sit in the angle between leaf and stem, and whether they remain dormant or break out into branches is governed by a tight hormonal and transcriptional network involving strigolactones, auxin and cytokinin. A transcription factor that simultaneously modulates this developmental switch and the stress response is unusual, and it hints that VvbHLH10 belongs to a growing group of bHLH proteins whose roles have diversified beyond single functions. In practical terms, the same gene that helps a vine survive degraded soil could also be tuned to change how the plant allocates its growth, a lever for shaping canopy structure and productivity.

The dual identity of VvbHLH10 fits into a broader emerging picture of the bHLH family. With hundreds of members in most plant genomes, bHLH transcription factors have been implicated in everyone’s favorite processes, from iron uptake and flavonoid biosynthesis to light signaling and hormone crosstalk. Group 9 bHLH factors, the subclass to which VvbHLH10 belongs, have drawn particular interest for their roles in abiotic stress responses. What this study adds is evidence that in a woody perennial crop of global economic importance, one group 9 member can be rapidly mobilized by salinity and alkalinity cues, act in the nucleus to dampen oxidative injury, and at the same time remodel shoot architecture by freeing axillary buds from dormancy.

For viticulture, the implications are concrete. Salt-alkali soils are expanding in many grape-growing regions as irrigation, climate change and intensive cultivation push pH and sodium levels upward, and vineyards on marginal land often suffer stunted vines, poor bud break and yield losses. A gene that improves survival under both saline and alkaline conditions, verified in both homologous and heterologous systems, offers a candidate target for marker-assisted selection or genome editing. Because VvbHLH10 is naturally expressed in latent buds, breeders could also exploit its developmental role to improve bud fertility and branching in varieties where shy bud break limits yield. The authors position VvbHLH10 as a promising candidate for the genetic improvement of both salt-alkali tolerance and plant architecture in grapevine.

The research, led by Rui Xu and Huiping Liu as co-first authors and corresponding author Ke Li, was published open access on 12 September 2026 after acceptance on 9 September, and was supported by the Key Research and Development Project of Shandong Province, the National Natural Science Foundation of China, the Shandong Provincial Natural Science Foundation and several programs at the Shandong Academy of Agricultural Sciences. The team also released transcriptomic datasets from VvbHLH10-overexpressing tomato as supplementary material, giving the community a resource to trace which downstream pathways the transcription factor rewires, from antioxidant defenses to branching hormones.

What remains to be resolved is the direct target repertoire of VvbHLH10 and how its stress-protective and developmental outputs are mechanistically linked. If the same set of bound promoters underlies both ROS quenching and bud release, that would suggest an elegant coupling in which growth resumption under stress is actively licensed rather than merely permitted. If the two functions run through separate downstream circuits, breeders may be able to dial in salt tolerance without unwanted changes in vine shape. Either outcome broadens understanding of the functional diversification of bHLH transcription factors in horticultural crops and brings grape growers one gene closer to vines that thrive where the soil fights back.

Subject of Research: Functional characterization of the VvbHLH10 transcription factor in grapevine salt-alkali stress tolerance and axillary bud growth regulation

Article Title: VvbHLH10 promotes axillary bud growth and salt-alkali tolerance in grapevine

Article References: Xu, R., Liu, H., Mu, Q., Li, A., Wang, F., & Li, K. (2026). VvbHLH10 promotes axillary bud growth and salt-alkali tolerance in grapevine. BMC Plant Biology. https://doi.org/10.1186/s12870-026-09949-x

Image Credits: AI Generated

DOI: 10.1186/s12870-026-09949-x

Keywords: grapevine, VvbHLH10, bHLH transcription factor, salt-alkali stress, axillary bud growth, reactive oxygen species, abiotic stress tolerance, Vitis vinifera, plant architecture, viticulture, plant molecular biology, transgenic plants