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Natural variation in the promoter of TGW2 determines grain width and weight in rice

文献类型： 外文期刊

作者： Ruan, Banpu 1 ; Shang, Lianguang 2 ; Zhang, Bin 1 ; Hu, Jiang 1 ; Wang, Yuexing 1 ; Lin, Hai 2 ; Zhang, Anpeng 1 ; Liu, C 1 ;

作者机构： 1.China Natl Rice Res Inst, State Key Lab Rice Biol, Hangzhou 310006, Zhejiang, Peoples R China

2.Chinese Acad Agr Sci, Guangdong Lab Lingnan Modern Agr, Agr Genom Inst Shenzhen, Shenzhen Branch,Genome Anal Lab,Minist Agr, Shenzhen 518124, Peoples R China

关键词： cell number regulator; grain width and weight; quantitative trait locus (QTL); rice; TGW2; yield

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）

ISSN： 0028-646X

年卷期：

页码：

收录情况： SCI

摘要： Understanding the genetic basis of natural variation in grain size among diverse rice varieties can help breeders develop high-yielding rice cultivars. Here, we report the discovery of qTGW2, a new semidominant quantitative trait locus for grain width and weight. The corresponding gene, TGW2, encodes CELL NUMBER REGULATOR 1 (OsCNR1) localized to the plasma membrane. A single nucleotide polymorphism (SNP) variation 1818 bp upstream of TGW2 is responsible for its different expression, leading to alteration in grain width and weight by influencing cell proliferation and expansion in glumes. TGW2 interacts with KRP1, a regulator of cell cycle in plants, to negatively regulate grain width and weight. Genetic diversity analysis of TGW2 in 141 rice accessions revealed it as a breeding target in a selective sweep region. Our findings provide new insights into the genetic mechanism underlying grain morphology and grain weight, and uncover a promising gene for improving rice yield.

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