Genome-wide characterization and adaptive evolution of favorable gibberellin 2-oxidase alleles contributing to wheat agronomic traits.
Bian Y, Dong J, Li L, Xu D, Tian X
Crop Improvement
Shorter wheat plants that yield more grain means the bread on your table could become more affordable and resilient to storms that flatten tall crops.
Wheat plants use a hormone called gibberellin to control how tall they grow, and researchers found specific gene versions that act like a volume knob — turning down plant height while turning up grain production. They discovered eight new beneficial gene variants, including a cluster of three related genes on one chromosome that work together to make shorter, more productive plants. By tracing where these gene versions came from and how they spread across wheat varieties worldwide, scientists now have a genetic roadmap for breeding better wheat.
Key Findings
Researchers identified 40 gibberellin-deactivating genes in wheat and found 8 new favorable gene variants (haplotypes) associated with reduced plant height and/or increased grain yield, in addition to 2 previously known ones.
A cluster of 3 tandem duplicate genes (TaGA2ox8-B1-1, -2, and -3) on wheat's B chromosome was linked to both shorter stature and higher grain yield simultaneously — rare since height reduction often penalizes yield.
The study developed diagnostic molecular markers for 52 major haplotypes across 19 gene locations, giving breeders practical tools to select for these beneficial traits without extensive field trials.
chevron_right Technical Summary
Scientists identified new genetic variants in wheat that reduce plant height while boosting grain yield, by studying genes that control the plant hormone gibberellin. These findings give breeders precise molecular tools to create more productive, shorter wheat varieties without sacrificing harvests.
Abstract Preview
Gibberellins are essential phytohormones that regulate plant growth and development. Gibberellin 2-oxidases (GA2oxs) deactivate bioactive gibberellin isoforms and many GA2ox genes have been validat...
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