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Maize ZmHSP90 plays a role in acclimation to salt stress

文献类型： 外文期刊

作者： Yu, Xinyan 1 ; Zhao, Yanxin 3 ; Wang, Yun 1 ; Zou, Zhiqing 2 ; Li, Fenghai 1 ;

作者机构： 1.Shenyang Agr Univ, Shenyang, Peoples R China

2.Win All High Tech Seed Co Ltd, Hefei, Peoples R China

3.Beijing Acad Agr & Forestry Sci BAAFS, Maize Res Ctr, Beijing, Peoples R China

关键词： Salt stress; Transcriptome; Maize; Overexpression; Tobacco

期刊名称：PEERJ （ 影响因子：2.7； 五年影响因子：3.1 ）

ISSN： 2167-8359

年卷期： 2023 年 11 卷

页码：

收录情况： SCI

摘要： Background. Maize is sensitive to salt stress, especially during the germination and seedling stages. Methods. We conducted germination experiments on 60 maize materials under salt stress, and screened out the most salt-tolerant and salt-sensitive varieties based on germination indicators. Afterwards, transcriptome analysis was performed to screen for key regulators in the plumule and flag leaf at the germination and seedling stages, respectively. Following that, transgenic tobacco was developed to expose the roles and mechanisms of the candidate genes, enabling a deeper investigation of their functions. Results. Out of the 60 inbred lines of maize, ''975-12'' exhibits the highest level of salt tolerance, while ''GEMS64'' displays the lowest. The application of salt stress resulted in a significant increase in the levels of antioxidant enzymes in both ''975-12'' and ''GEMS64''. ABA signal transduction and jasmonic acid pathways were the pathways that mainly affected by salt stress. In addition, a significant finding has been made indicating that when exposed to high levels of salt stress, the expression of ZmHSP90 in '975-12' increased while in 'GEMS64' decreased. Furthermore, in tobacco plants overexpressing ZmHSP90, there was an increase in antioxidant enzyme activity associated with salt tolerance. ZmHSP90 enhanced the expression levels of NtSOS1, NtHKT1, and NtNHX1 as compared to those in the salt treatment, causing the maintenance of Na+ and K+ homeostasis, suggesting that high expression of ZmHSP90 was conducive to regulate Na+ transporters to maintain K+/Na+ balanced in tobacco.

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