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A mitogen-activated protein kinase phosphatase influences grain size and weight in rice

文献类型： 外文期刊

作者： Xu, Ran 1 ; Yu, Haiyue 1 ; Wang, Junmin 3 ; Duan, Penggen 1 ; Zhang, Baolan 1 ; Li, Jing 1 ; Li, Yu 1 ; Xu, Jinsong 1 ; Lyu, 1 ;

作者机构： 1.Chinese Acad Sci, Inst Genet & Dev Biol, CAS Ctr Excellence Mol Plant Biol, State Key Lab Plant Cell & Chromosome Engn, Beijing 100101, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Crop Sci & Nucl Technol Utilizat, Hangzhou 310021, Zhejiang, Peoples R China

关键词： OsMKP1; OsMAPK6; cell proliferation; grain size; Oryza sativa

期刊名称：PLANT JOURNAL （ 影响因子：6.417； 五年影响因子：7.627 ）

ISSN： 0960-7412

年卷期： 2018 年 95 卷 6 期

页码：

收录情况： SCI

摘要： Grain size and weight are directly associated with grain yield in crops. However, the molecular mechanisms that set final grain size and weight remain largely unknown. Here, we characterize two large grain mutants, large grain8-1 (large8-1) and large grain8-2 (large8-2). LARGE8 encodes the mitogen-activated protein kinase phosphatase1 (OsMKP1). Loss of function mutations in OsMKP1 results in large grains, while overexpression of OsMKP1 leads to small grains. OsMKP1 determines grain size by restricting cell proliferation in grain hulls. OsMKP1 directly interacts with and deactivates the mitogen-activated protein kinase 6 (OsMAPK6). Taken together, we identify OsMKP1 as a crucial factor that influences grain size by deactivating OsMAPK6, indicating that the reversible phosphorylation of OsMAPK6 plays important roles in determining grain size in rice.

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