Natural Variation in OsMKK3 Contributes to Grain Size and Chalkiness in Rice

• DOI: 10.3389/fpls.2021.784037
• Publication Date: 2021-12-01T01:16:43Z
• Authors: Yinghua Pan; Lei Chen; Yan Zhao; Haifeng Guo; Jingcheng Li; Muhammad Abdul Re...; Chunju Lu; Weiyong Zhou; Xingka Yang; Yuntao Liang; Hao Wu; Dongjing Qing; Lijun Gao; Gaoxing Dai; Danting Li; Guofu Deng
• Keywords: Variation (astronomy)

Rice (Oryza sativa L.) is an important staple food crop for more than half of the world's population. Enhancing grain quality and yield rice to meet growing demand remains a major challenge. Here, we show that OsMKK3 encode MAP kinase controls size chalkiness by affecting cell proliferation in spikelet hulls. We showed OsSPL16, GS5, GIF1 have substantial effect on OsMKK3-regulated pathway. has experienced strong directional selection indica japonica. Wild accessions contained four haplotypes, suggesting haplotypes present cultivated likely originated from different wild during domestication. OsMKK3-Hap1, gs3, gw8 were polymerized enhance length. Polymerization beneficial alleles, such as gw8, fgr, alk, chalk5, wx, also improved hybrid rice. Overall, results indicated alleles could be used genomic-assisted breeding cultivar improvement with other alleles.