Natural variation of OsGluA2 is involved in grain protein content regulation in rice

Yihao Yang, Min Guo, Shengyuan Sun, Yelu Zou, Shuangyi Yin, Yannan Liu, Shuzhu Tang, Minghong Gu, Zefeng Yang () and Changjie Yan ()
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Yihao Yang: Yangzhou University
Min Guo: Yangzhou University
Shengyuan Sun: Yangzhou University
Yelu Zou: Yangzhou University
Shuangyi Yin: Yangzhou University
Yannan Liu: Yangzhou University
Shuzhu Tang: Yangzhou University
Minghong Gu: Yangzhou University
Zefeng Yang: Yangzhou University
Changjie Yan: Yangzhou University

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract Grain protein content (GPC) affects rice nutrition quality. Here, we identify two stable quantitative trait loci (QTLs), qGPC-1 and qGPC-10, controlling GPC in a mapping population derived from indica and japonica cultivars crossing. Map-based cloning reveals that OsGluA2, encoding a glutelin type-A2 precursor, is the candidate gene underlying qGPC-10. It functions as a positive regulator of GPC and has a pleiotropic effect on rice grain quality. One SNP located in OsGluA2 promoter region is associated with its transcript expression level and GPC diversity. Polymorphisms of this nucleotide can divide all haplotypes into low (OsGluA2LET) and high (OsGluA2HET) expression types. Population genetic and evolutionary analyses reveal that OsGluA2LET, mainly present in japonica accessions, originates from wild rice. However, OsGluA2HET, the dominant type in indica, is acquired through mutation of OsGluA2LET. Our results shed light on the understanding of natural variations of GPC between indica and japonica subspecies.

Date: 2019
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DOI: 10.1038/s41467-019-09919-y

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