The SnRK2-APC/CTEregulatory module mediates the antagonistic action of gibberellic acid and abscisic acid pathways
Date：2016-07-04Author：AdminSource：ICS
Nature Communications 6, Article number: 7981 doi:10.1038/ncomms8981
Qibing Lin,Fuqing Wu,Peike Sheng,Zhe Zhang,Xin Zhang,Xiuping Guo,Jiulin Wang, Zhijun Cheng,Jie Wang,Haiyang Wang& Jianmin Wan
Abstract
Abscisic acid (ABA) and gibberellic acid (GA) antagonistically regulate many developmental processes and responses to biotic or abiotic stresses in higher plants. However, the molecular mechanism underlying this antagonism is still poorly understood. Here, we show that loss-of-function mutation in rice Tiller Enhancer (TE), an activator of the APC/CTE complex, causes hypersensitivity and hyposensitivity to ABA and GA, respectively. We find that TE physically interacts with ABA receptor OsPYL/RCARs and promotes their degradation by the proteasome. Genetic analysis also shows OsPYL/RCARs act downstream of TE in mediating ABA responses. Conversely, ABA inhibits APC/CTE activity by phosphorylating TE through activating the SNF1-related protein kinases (SnRK2s), which may interrupt the interaction between TE and OsPYL/RCARs and subsequently stabilize OsPYL/RCARs. In contrast, GA can reduce the level of SnRK2s and may promote APC/CTE-mediated degradation of OsPYL/RCARs. Thus, we propose that the SnRK2-APC/CTE regulatory module represents a regulatory hub underlying the antagonistic action of GA and ABA in plants.
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