A Rare Allele of GS2 Enhances Grain Size and Grain Yield in Rice

文献类型： 外文期刊

第一作者： Hu, Jiang

作者： Hu, Jiang;Wang, Yuexing;Fang, Yunxia;Xu, Jie;Yu, Haiping;Shi, Zhenyuan;Pan, Jiangjie;Zhang, Dong;Zhu, Li;Dong, Guojun;Guo, Longbiao;Zeng, Dali;Zhang, Guangheng;Xie, Lihong;Qian, Qian;Zeng, Longjun;Kang, Shujing;Xiong, Guosheng;Qian, Qian;Li, Jiayang;Li, Jiayang

作者机构：

关键词： GS2;OsGRF4;QTL;grain size;miR396c;rice

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

ISSN： 1674-2052

年卷期： 2015 年 8 卷 10 期

页码：

收录情况： SCI

摘要： Grain size determines grain weight and affects grain quality. Several major quantitative trait loci (QTLs) regulating grain size have been cloned; however, our understanding of the underlying mechanism that regulates the size of rice grains remains fragmentary. Here, we report the cloning and characterization of a dominant QTL, GRAIN SIZE ON CHROMOSOME 2 (GS2), which encodes Growth-Regulating Factor 4 (OsGRF4), a transcriptional regulator. GS2 localizes to the nucleus and may act as a transcription activator. A rare mutation of GS2 affecting the binding site of a microRNA, OsmiR396c, causes elevated expression of GS2/OsGRF4. The increase in GS2 expression leads to larger cells and increased numbers of cells, which thus enhances grain weight and yield. The introduction of this rare allele of GS2/OsGRF4 into rice cultivars could significantly enhance grain weight and increase grain yield, with possible applications in breeding high-yield rice varieties.

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