文献类型： 外文期刊
作者： Yan, Zhenwei 1 ; Zhang, Fajun 1 ; Mu, Chunhua 1 ; Ma, Changle 2 ; Yao, Guoqi 1 ; Sun, Yue 3 ; Hou, Jing 4 ; Leng, Bingying 1 ; Liu, Xia 1 ;
作者机构： 1.Shandong Acad Agr Sci, Maize Res Inst, Jinan 250100, Peoples R China
2.Shandong Normal Univ, Coll Life Sci, Jinan 250300, Peoples R China
3.Qingdao Agr Univ, Coll Agron, Qingdao 266109, Peoples R China
4.Ludong Univ, Sch Agr, Yantai 264001, Peoples R China
关键词： ABA response; drought tolerance; maize; ZmbHLH47; ZmSnRK2.9
期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.6； 五年影响因子：6.2 ）
ISSN： 1661-6596
年卷期： 2024 年 25 卷 9 期
页码：
收录情况： SCI
摘要： Drought stress globally poses a significant threat to maize (Zea mays L.) productivity and the underlying molecular mechanisms of drought tolerance remain elusive. In this study, we characterized ZmbHLH47, a basic helix-loop-helix (bHLH) transcription factor, as a positive regulator of drought tolerance in maize. ZmbHLH47 expression was notably induced by both drought stress and abscisic acid (ABA). Transgenic plants overexpressing ZmbHLH47 displayed elevated drought tolerance and ABA responsiveness, while the zmbhlh47 mutant exhibited increased drought sensitivity and reduced ABA sensitivity. Mechanistically, it was revealed that ZmbHLH47 could directly bind to the promoter of ZmSnRK2.9 gene, a member of the subgroup III SnRK2 kinases, activating its expression. Furthermore, ZmSnRK2.9-overexpressing plants exhibited enhanced ABA sensitivity and drought tolerance, whereas the zmsnrk2.9 mutant displayed a decreased sensitivity to both. Notably, overexpressing ZmbHLH47 in the zmsnrk2.9 mutant closely resembled the zmsnrk2.9 mutant, indicating the importance of the ZmbHLH47-ZmSnRK2.9 module in ABA response and drought tolerance. These findings provided valuable insights and a potential genetic resource for enhancing the environmental adaptability of maize.
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