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Maize ZmBES1/BZR1-4 recruits ZmTLP5 to regulate drought tolerance and seed development by regulating ZmPum6 and ZmMBP1

文献类型： 外文期刊

作者： Feng, Wenqi 1 ; Zhou, Yuhan 1 ; Duan, Huaming 1 ; Zhou, Wenxi 1 ; Zhang, Xin 1 ; Liu, Yuan 1 ; Zhang, Hongwanjun 1 ; Wei, Junxin 1 ; Wan, Tao 1 ; Liu, Yajie 1 ; Xu, Wen 1 ; Yang, Qingqing 1 ; Qu, Jingtao 2 ; Zhang, Yuanyuan 3 ; Li, Wanchen 1 ; Lu, Yanli 1 ; Fu, Fengling 1 ; Yu, Haoqiang 1 ;

作者机构： 1.Sichuan Agr Univ, Maize Res Inst, Chengdu 611130, Peoples R China

2.Shanghai Acad Agr Sci, Crop Breeding & Cultivat Res Inst, CIMMYT China Specialty Maize Res Ctr, Shanghai 201403, Peoples R China

3.Mianyang Normal Univ, Coll Life Sci & Biotechnol, Mianyang 621000, Peoples R China

4.Sichuan Agr Univ, State Key Lab Crop Gene Explorat & Utilizat Southw, Chengdu 611130, Peoples R China

5.Sichuan Univ, Coll Life Sci, Chengdu 610064, Peoples R China

关键词： maize; transcription factor; BES1/BZR1; drought stress; seed development

期刊名称：PLANT JOURNAL （ 影响因子：5.7； 五年影响因子：7.0 ）

ISSN： 0960-7412

年卷期： 2025 年 122 卷 1 期

页码：

收录情况： SCI

摘要： BES1/BZR1, a kind of plant-specific transcription factor (TF), has been reported to regulate growth, development, and stress response. However, the maize BES1/BZR1 members are still largely unknown. In this study, we investigated the function and regulatory mechanism of maize ZmBES1/BZR1-4 in regulating drought response and seed development. The ZmBES1/BZR1-4 was localized in the nucleus depending on its bHLH domain and showed no self-transactivation activity. The transcription level of ZmBES1/BZR1-4 was induced by drought stress and was predominantly higher in seeds 25 days after pollination. Overexpression of ZmBES1/BZR1-4 reduced drought tolerance but produced bigger seeds with higher seed weight in transgenic Arabidopsis, rice, and maize. Inversely, the ZmBES1/BZR1-4 mutant Mu4-1 and Mu4-2 showed enhancement of drought tolerance and decreased seed size and weight. The ZmBES1/BZR1-4 could directly bind to E-box elements in the ZmMBP1 and ZmPum6 promoters to activate their transcription. Furthermore, the interaction between ZmBES1/BZR1-4 and ZmTLP5 enhanced the ZmMBP1 and ZmPum6 transcription. Moreover, ZmMBP1 and ZmPum6 positively regulated seed size and weight, but ZmPum6 negatively regulated drought tolerance. Therefore, our findings reveal that ZmBES1/BZR1-4 recruits ZmTLP5 to regulate drought tolerance and seed development by regulating ZmMBP1 and ZmPum6, which contributes to uncovering the function of BES1/BZR1s regulating growth, development, and stress response in crops.

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