GW9 determines grain size and floral organ identity in rice

文献类型： 外文期刊

第一作者： Wen, Yi

作者： Wen, Yi;Hu, Peng;Tan, Yiqing;Wang, Yueying;Wu, Hao;Wang, Junge;Wu, Kaixiong;Chai, Bingze;Zhu, Li;Zhang, Guangheng;Gao, Zhenyu;Ren, Deyong;Zeng, Dali;Shen, Lan;Dong, Guojun;Zhang, Qiang;Li, Qing;Qian, Qian;Hu, Jiang;Fang, Yunxia;Xue, Dawei;Wang, Yueying;Xiong, Guosheng

作者机构： China Natl Rice Res Inst, State Key Lab Rice Biol & Breeding, Hangzhou, Peoples R China;Hangzhou Normal Univ, Coll Life & Environm Sci, Hangzhou, Peoples R China;Nanjing Agr Univ, Plant Phen Res Ctr, Nanjing, Peoples R China

关键词： grain size and weight; floral organ identity; GW9; GW2; PRC2 complex; rice

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 2022影响因子：13.8； 五年影响因子：13.2 ）

ISSN： 1467-7644

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Grain weight is an important determinant of grain yield. However, the underlying regulatory mechanisms for grain size remain to be fully elucidated. Here, we identify a rice mutant grain weight 9 (gw9), which exhibits larger and heavier grains due to excessive cell proliferation and expansion in spikelet hull. GW9 encodes a nucleus-localized protein containing both C2H2 zinc finger (C2H2-ZnF) and VRN2-EMF2-FIS2-SUZ12 (VEFS) domains, serving as a negative regulator of grain size and weight. Interestingly, the non-frameshift mutations in C2H2-ZnF domain result in increased plant height and larger grain size, whereas frameshift mutations in both C2H2-ZnF and VEFS domains lead to dwarf and malformed spikelet. These observations indicated the dual functions of GW9 in regulating grain size and floral organ identity through the C2H2-ZnF and VEFS domains, respectively. Further investigation revealed the interaction between GW9 and the E3 ubiquitin ligase protein GW2, with GW9 being the target of ubiquitination by GW2. Genetic analyses suggest that GW9 and GW2 function in a coordinated pathway controlling grain size and weight. Our findings provide a novel insight into the functional role of GW9 in the regulation of grain size and weight, offering potential molecular strategies for improving rice yield.

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