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

文献类型： 外文期刊

第一作者： Qiao, Shenglong

作者： Qiao, Shenglong;Li, Chengxiang;Li, Xiaoming;Wang, Tao;Leng, Linna;Qiao, Shenglong;Li, Chengxiang;Li, Xiaoming;Wang, Tao;Leng, Linna;Sun, Shiyong;Wang, Linlin;Wu, Zhihua;Wang, Xuelu;Tian, Weisheng;Lu, Tiegang

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期刊名称：PLANT CELL （ 影响因子：11.277； 五年影响因子：12.061 ）

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收录情况： SCI

摘要： 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.

分类号： Q942

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