HAM1 negatively regulates drought tolerance in Brassica juncea.
Meng Y, Liu Z, Che J, Li Z, Guan X
Climate Adaptation
Growing mustard greens through a dry stretch just got scientifically interesting: the gene quietly sabotaging the plant's drought survival has finally been named, and breeders can now work around it to develop tougher varieties for drought-prone gardens and farms.
Indian mustard — the plant behind spicy greens and cooking oil — has a gene that acts like a brake on its ability to handle dry conditions. Researchers scanned hundreds of mustard varieties and found that this one gene, when it's working normally, suppresses a hormone-related signal the plant uses to cope with drought. Two natural mutations in this gene make things even worse, but now that scientists know exactly where the brake is, plant breeders have a clear roadmap for removing it and creating varieties that handle water stress much better.
Key Findings
A GRAS-family transcription factor gene (HAM1) was identified via genome-wide association study as a key negative regulator of drought tolerance across geographically diverse Brassica juncea accessions.
Two structural variants within HAM1 significantly impair drought tolerance by suppressing the downstream gene UGT76C2, a cytokinin glycosyltransferase involved in hormone signaling.
HAM1 directly binds GT cis-elements in the UGT76C2 promoter, confirmed through heterologous expression in Arabidopsis — providing a mechanistic target for precision breeding of drought-resistant mustard.
chevron_right Technical Summary
Scientists identified a gene in Indian mustard (Brassica juncea) that actively suppresses the plant's own drought survival machinery. By pinpointing the exact mutations that break this gene's function, researchers now have a clear genetic target for breeding water-stress-tolerant mustard varieties suited to drier climates.
Abstract Preview
Drought stress poses a severe and growing threat to global crop production due to climate change. Brassica juncea is an important vegetable and oil crop with high potential for cultivation in arid ...
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Brassica juncea, commonly mustard greens, brown mustard, Chinese mustard, Indian mustard, Japanese mustard, Korean green mustard, leaf mustard, Oriental mustard and vegetable mustard, is a species of mustard plant.