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

The Plant Journal : for Cell and Molecular Biology
Ran XuYunhai Li

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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Citations

Sep 7, 2018·The Plant Journal : for Cell and Molecular Biology·Alisdair R Fernie
Nov 11, 2018·Journal of Integrative Plant Biology·Tao WangShuangcheng Li
Nov 14, 2018·Journal of Integrative Plant Biology·Jemima Brinton, Cristobal Uauy
Jan 1, 2019·Journal of Integrative Plant Biology·Ran XuYunhai Li
Dec 8, 2019·Journal of Experimental Botany·Changxun FangWenxiong Lin
Dec 13, 2019·The Plant Journal : for Cell and Molecular Biology·Yong HuangYongzhong Xing
Mar 27, 2020·International Journal of Molecular Sciences·Xiaoshu DengXianjun Wu
Feb 24, 2019·Annual Review of Plant Biology·Na LiYunhai Li
May 23, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Zhixuan DuHaohua He
May 1, 2021·Molecular Plant·Jianqin HaoYunhai Li
Jan 19, 2022·EMBO Reports·Tongjun Sun, Yuelin Zhang

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