Fine mapping and transcriptomics reveal OSG function in regulation of grain size and pollen fertility in rice (Oryza sativa).

ABSTRACT: Grain shape is a critical factor that directly influences rice yield and quality, however, the molecular mechanisms underlying the regulation of grain shape development remains elusive. In this study, we characterized an oval-shaped grain mutant, osg, from the rice radiation mutagenesis mutant library via 60Co-γ ray irradiation. Compared to ZH11, the osg mutant exhibited decreased grain length and thousand-grain weight but increased grain width and thickness, while displaying significantly reduced plant height, tiller number, pollen viability, and seed setting rate. Map-based cloning revealed that OsSRS3, a known regulator of rice grain size and fertility, was identified as the candidate gene for OSG. The loss-of-function mutant in OsSRS3 exhibit abnormal phenotypes similar to that in osg.

SUBMITTER: Zhao S 

PROVIDER: S-EPMC12782402 | biostudies-literature | 2026

REPOSITORIES: biostudies-literature