A mitogen‐activated protein kinase phosphatase influences grain size and weight in rice |
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| Authors: | Ran Xu Haiyue Yu Junmin Wang Penggen Duan Baolan Zhang Jing Li Yu Li Jinsong Xu Jia Lyu Na Li Tuanyao Chai Yunhai Li |
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| Institution: | 1. State Key Laboratory of Plant Cell and Chromosome Engineering, CAS Centre for Excellence in Molecular Plant Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China;2. University of Chinese Academy of Sciences, Beijing, China;3. Institute of Crop Science and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou, China |
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| Abstract: | 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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| Keywords: | OsMKP1 OsMAPK6 cell proliferation grain size
Oryza sativa
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