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Somatic embryogenetic receptor kinase TaSERL2 regulates heat stress tolerance in wheat by influencing TaBZR2 protein stability and transcriptional activity

文献类型： 外文期刊

作者： Hao, Xiang-Yang 1 ; Yu, Tai-Fei 3 ; Peng, Chao-Jun 2 ; Fu, Yi-Han 1 ; Fang, Yu-Hui 2 ; Li, Yan 2 ; Xu, Zhao-Shi 3 ; Chen, Jun 3 ; Dong, Hai-Bin 2 ; Ma, You-Zhi 3 ; Xu, Wei-Gang 1 ;

作者机构： 1.Henan Agr Univ, Coll Agron, Collaborat Innovat Ctr Henan Grain Crops, State Key Lab Wheat & Maize Crop Sci, Zhengzhou, Henan, Peoples R China

2.Henan Acad Agr Sci, Inst Crops Mol Breeding, Natl Engn Lab Wheat, Minist Agr,Henan Key Lab Wheat Germplasm Resources, Zhengzhou, Henan, Peoples R China

3.Chinese Acad Agr Sci CAAS, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Beijing, Peoples R China

4.Shennong Lab, Zhengzhou, Henan, Peoples R China

关键词： common wheat; TaBZR2; heat stress; interaction identification; signal transduction; negative regulation

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：10.5； 五年影响因子：12.4 ）

ISSN： 1467-7644

年卷期： 2025 年 23 卷 7 期

页码：

收录情况： SCI

摘要： Heat stress is a major factor limiting crop yield, a challenge intensified by climate change. Initial findings indicate that BES1/BZR1 may use heat shock to regulate plant thermal adaptability independently of BIN2-mediated brassinosteroid signalling, although the exact molecular mechanism remains unclear. In this study, we identified TaBZR2, a wheat gene whose expression showed a strong positive correlation with heat stress tolerance, based on transcriptome analysis of heat-tolerant wheat cultivars. Overexpression of TaBZR2 enhanced heat stress tolerance, while RNA interference of TaBZR2 reduced it. Further analysis revealed that TaBZR2 interacts with and is phosphorylated by wheat somatic embryogenesis receptor-like kinase 2 (TaSERL2). Overexpression of TaSERL2 reduced heat stress tolerance by promoting TaBZR2 degradation and inhibiting its regulation of wheat heat stress response genes. However, heat stress reduced the phosphorylation levels of both TaSERL2 and TaBZR2, lessening TaSERL2's inhibitory effect on TaBZR2 and enhancing the stability of TaBZR2. These results reveal that the TaSERL2-TaBZR2 module negatively regulates plant heat stress tolerance. This study expands the current model of heat stress responses and provides evidence for the role of BES1/BZR1 in heat stress regulation independent of brassinosteroid signalling.

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