The RLA1/SMOS1 Transcription Factor Functions with OsBZR1 to Regulate Brassinosteroid Signaling and Rice Architecture

Brassinosteroids (BRs) are plant-specific steroid hormones that control plant growth and development. Recent studies have identified key components of the BR signaling pathway in Arabidopsis thaliana and in rice (Oryza sativa); however, the mechanism of BR signaling in rice, especially downstream of...

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Bibliographic Details
Published in:The Plant cell 2017-02, Vol.29 (2), p.292-309
Main Authors: Qiao, Shenglong, Sun, Shiyong, Wang, Linlin, Wu, Zhihua, Li, Chengxiang, Li, Xiaoming, Wang, Tao, Leng, Linna, Tian, Weisheng, Lu, Tiegang, Wang, Xuelu
Format: Article
Language:English
Subjects:
Arabidopsis thaliana
Binding Sites
Brassinosteroids
Brassinosteroids - metabolism
Cloning
Cloning, Molecular
Deoxyribonucleic acid
DNA
Gene Expression Regulation, Plant
Genetic analysis
Genetic Complementation Test
Hormones
Kinases
Oryza - genetics
Oryza - growth & development
Oryza - metabolism
Oryza sativa
Plant growth
Plant Proteins - genetics
Plant Proteins - metabolism
Plant Proteins - physiology
Rice
Signal Transduction
Signaling
Steroid hormones
Transcription factors
Transcription Factors - genetics
Transcription Factors - metabolism
Transcription Factors - physiology
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Summary:Brassinosteroids (BRs) are plant-specific steroid hormones that control plant growth and development. Recent studies have identified key components of the BR signaling pathway in Arabidopsis thaliana and in rice (Oryza sativa); however, the mechanism of BR signaling in rice, especially downstream of GSK3/SHAGGY-like kinase (GSK2), remains unclear. Here, we identified a BR-insensitive rice mutant, reduced leaf angle1 (rla1), and cloned the corresponding gene. RLA1 was identical to the previously reported SMALL ORGAN SIZE1 (SMOS1), which was cloned from another allele. RLA1/SMOS1 encodes a transcription factor with an APETALA2 DNA binding domain. Genetic analysis indicated that RLA1/SMOS1 functions as a positive regulator in the BR signaling pathway and is required for the function of BRASSINAZOLE-RESISTANT1 (OsBZR1). In addition, RLA1/SMOS1 can interact with OsBZR1 to enhance its transcriptional activity. GSK2 can interact with and phosphorylate RLA1/SMOS1 to reduce its stability. These results demonstrate that RLA1/SMOS1 acts as an integrator of the transcriptional complex directly downstream of GSK2 and plays an essential role in BR signaling and plant development in rice.
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.16.00611