TaGS5-3A Gene in Wheat Regulates Grain Size and Yield
October 21, 2015| |
Grain size is a component of grain weight in cereals. Earlier studies have shown that OsGS5 gene plays a major role in regulating both grain size and weight in rice via promotion of cell division. Researchers from Northwest A & F University and the Chinese Academy of Agricultural Sciences in China isolated TaGS5 homologs in wheat and found them on chromosomes 3A, 3B and 3D.
The TaGS5 homologs were expressed in young rice spikes and developing grains. The TaGS5 homolog in chromosome 3A, TaGS5-3A, had two alleles identified, TaGS5-3A-T and TaGS5-3A-G. Developed transgenic rice lines overexpressing TaGS5-3A-T allele exhibited larger grain size and higher thousand kernel weight than TaGS5-3A-G lines. TaGS5-3A-T was therefore significantly correlated with larger grain size and higher thousand kernel weight.
Results suggest that TaGS5-3A is a positive regulator of grain size and its allele TaGS5-3A-T exhibits potential applications in high-yield breeding.
For more information on the study, read the article in Plant Biotechnology Journal.
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