SLR1 inhibits MOC1 degradation to coordinate tiller number and plant height in rice

Zhigang Liao, Hong Yu, Jingbo Duan, Kun Yuan, Chaoji Yu, Xiangbing Meng, Liquan Kou, Mingjiang Chen, Yanhui Jing, Guifu Liu, Steven M. Smith and Jiayang Li ()
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Zhigang Liao: Chinese Academy of Sciences
Hong Yu: Chinese Academy of Sciences
Jingbo Duan: Chinese Academy of Sciences
Kun Yuan: Chinese Academy of Sciences
Chaoji Yu: Chinese Academy of Sciences
Xiangbing Meng: Chinese Academy of Sciences
Liquan Kou: Chinese Academy of Sciences
Mingjiang Chen: Chinese Academy of Sciences
Yanhui Jing: Chinese Academy of Sciences
Guifu Liu: Chinese Academy of Sciences
Steven M. Smith: Chinese Academy of Sciences
Jiayang Li: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract The breeding of cereals with altered gibberellin (GA) signaling propelled the ‘Green Revolution’ by generating semidwarf plants with increased tiller number. The mechanism by which GAs promote shoot height has been studied extensively, but it is not known what causes the inverse relationship between plant height and tiller number. Here we show that rice tiller number regulator MONOCULM 1 (MOC1) is protected from degradation by binding to the DELLA protein SLENDER RICE 1 (SLR1). GAs trigger the degradation of SLR1, leading to stem elongation and also to the degradation of MOC1, and hence a decrease in tiller number. This discovery provides a molecular explanation for the coordinated control of plant height and tiller number in rice by GAs, SLR1 and MOC1.

Date: 2019
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DOI: 10.1038/s41467-019-10667-2

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