RD26 mediates crosstalk between drought and brassinosteroid signalling pathways

Huaxun Ye, Sanzhen Liu, Buyun Tang, Jiani Chen, Zhouli Xie, Trevor M. Nolan, Hao Jiang, Hongqing Guo, Hung-Ying Lin, Lei Li, Yanqun Wang, Hongning Tong, Mingcai Zhang, Chengcai Chu, Zhaohu Li, Maneesha Aluru, Srinivas Aluru, Patrick S. Schnable and Yanhai Yin ()
Additional contact information
Huaxun Ye: Development and Cell Biology, Iowa State University
Sanzhen Liu: Iowa State University
Buyun Tang: Development and Cell Biology, Iowa State University
Jiani Chen: Development and Cell Biology, Iowa State University
Zhouli Xie: Development and Cell Biology, Iowa State University
Trevor M. Nolan: Development and Cell Biology, Iowa State University
Hao Jiang: Development and Cell Biology, Iowa State University
Hongqing Guo: Development and Cell Biology, Iowa State University
Hung-Ying Lin: Iowa State University
Lei Li: Harvard Medical School
Yanqun Wang: Harvard Medical School
Hongning Tong: Institute of Genetics, Chinese Academy of Sciences
Mingcai Zhang: State Key Laboratory of Plant Physiology and Biochemistry, College of Agronomy and Biotechnology, China Agricultural University
Chengcai Chu: Institute of Genetics, Chinese Academy of Sciences
Zhaohu Li: State Key Laboratory of Plant Physiology and Biochemistry, College of Agronomy and Biotechnology, China Agricultural University
Maneesha Aluru: School of Biology, Georgia Institute of Technology
Srinivas Aluru: School of Computational Science and Engineering, Georgia Institute of Technology
Patrick S. Schnable: Iowa State University
Yanhai Yin: Development and Cell Biology, Iowa State University

Nature Communications, 2017, vol. 8, issue 1, 1-13

Abstract: Abstract Brassinosteroids (BRs) regulate plant growth and stress responses via the BES1/BZR1 family of transcription factors, which regulate the expression of thousands of downstream genes. BRs are involved in the response to drought, however the mechanistic understanding of interactions between BR signalling and drought response remains to be established. Here we show that transcription factor RD26 mediates crosstalk between drought and BR signalling. When overexpressed, BES1 target gene RD26 can inhibit BR-regulated growth. Global gene expression studies suggest that RD26 can act antagonistically to BR to regulate the expression of a subset of BES1-regulated genes, thereby inhibiting BR function. We show that RD26 can interact with BES1 protein and antagonize BES1 transcriptional activity on BR-regulated genes and that BR signalling can also repress expression of RD26 and its homologues and inhibit drought responses. Our results thus reveal a mechanism coordinating plant growth and drought tolerance.

Date: 2017
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DOI: 10.1038/ncomms14573

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