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OsPP2C09, a negative regulatory factor in abscisic acid signalling, plays an essential role in balancing plant growth and drought tolerance in rice

文献类型： 外文期刊

作者： Miao, Jun 1 ; Li, Xianfeng 1 ; Li, Xiangbo 1 ; Tan, Wenchen 1 ; You, Aiqing 3 ; Wu, Shujun 4 ; Tao, Yajun 5 ; Chen, Chen; 1 ;

作者机构： 1.Yangzhou Univ, Agr Coll, Jiangsu Key Lab Crop Genom & Mol Breeding,Key Lab, Jiangsu Key Lab Crop Genet & Physiol,Minist Educ, Yangzhou 225009, Jiangsu, Peoples R China

2.Yangzhou Univ, Jiangsu Coinnovat Ctr Modern Prod Technol Grain C, Yangzhou 225009, Jiangsu, Peoples R China

3.Hubei Acad Agr Sci, Inst Food Crops, Wuhan 430064, Peoples R China

4.Shanghai Acad Agr Sci, Crop Breeding & Cultivat Res Inst, Shanghai 201403, Peoples R China

5.Jiangsu Acad Agr Sci, Inst Food Crops, Nanjing 210014, Peoples R China

关键词： abscisic acid signalling; drought tolerance; plant growth; rice (Oryza sativaL; ); type 2C protein phosphatase

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）

ISSN： 0028-646X

年卷期： 2020 年 227 卷 5 期

页码：

收录情况： SCI

摘要： Plants maintain a dynamic balance between plant growth and stress tolerance to optimise their fitness and ensure survival. Here, we investigated the roles of a clade A type 2C protein phosphatase (PP2C)-encoding gene,OsPP2C09, in regulating the trade-off between plant growth and drought tolerance in rice (Oryza sativaL.). The OsPP2C09 protein interacted with the core components of abscisic acid (ABA) signalling and showed PP2C phosphatase activityin vitro.OsPP2C09positively affected plant growth but acted as a negative regulator of drought tolerance through ABA signalling. Transcript and protein levels ofOsPP2C09were rapidly induced by exogenous ABA treatments, which suppressed excessive ABA signalling and plant growth arrest.OsPP2C09transcript levels in roots were much higher than those in shoots under normal conditions. After ABA, polyethylene glycol and dehydration treatments, the accumulation rate ofOsPP2C09transcripts in roots was more rapid and greater than that in shoots. This differential expression between the roots and shoots may increase the plant's root-to-shoot ratio under drought-stress conditions. This study sheds new light on the roles of OsPP2C09 in coordinating plant growth and drought tolerance. In particular, we propose that OsPP2C09-mediated ABA desensitisation contributes to root elongation under drought-stress conditions in rice.

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