文献类型： 外文期刊
作者： Yan, Zhenwei 1 ; Li, Ke 2 ; Li, Yanli 3 ; Wang, Wenli 1 ; Leng, Bingying 1 ; Yao, Guoqi 1 ; Zhang, Fajun 1 ; Mu, Chunhua 1 ; Liu, Xia 1 ;
作者机构： 1.Shandong Acad Agr Sci, Maize Res Inst, Jinan 250100, Shandong, Peoples R China
2.Shandong Acad Agr Sci, Shandong Acad Grape, Jinan 250100, Shandong, Peoples R China
3.Shandong Acad Agr Sci, Inst Ind Crops, Jinan 250100, Shandong, Peoples R China
关键词： Signal transduction; Maize; Salt stress
期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.2； 五年影响因子：7.8 ）
ISSN： 0141-8130
年卷期： 2023 年 253 卷
页码：
收录情况： SCI
摘要： The growth and productivity of maize (Zea mays), along with other crop plants, can be significantly hindered by salt stress. Nevertheless, the precise molecular mechanism underlying salt tolerance in maize has yet to be fully elucidated. Hence, it was attempted to identify ZmIAA9, a member of the maize Aux/IAA gene family, as a positive regulator of salt tolerance in maize, which was accompanied by the increased ROS detoxification and elevated transcript abundances of ROS scavenging genes. Molecular and biochemical assays have provided compelling evidence that ZmbHLH32, a transcription factor belonging to the bHLH family, was capable of binding directly to the promoter region of ZmIAA9, thereby activating its expression. This interaction between ZmbHLH32 and ZmIAA9 could be critical for the regulation of salt tolerance in maize. As expected, overexpression of ZmbHLH32 led to the enhanced salt tolerance. In contrast, decreased salt tolerance was attained after application of knockout mutants of ZmbHLH32. Furthermore, ZmARF1, which could act as a downstream of ZmIAA9, was found to physically interact with ZmIAA9 and repress the expression levels of ROS scavenging genes. Thus, our work uncovers a novel mechanism of ZmbHLH32-ZmIAA9-ZmARF1 module-mediated salt tolerance in maize, which can be exploited for breeding salt-tolerant maize varieties.
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