The HD-Zip I transcription factor MdHB-7 regulates drought tolerance in transgenic apple (Malus domestica)

文献类型： 外文期刊

第一作者： Zhao, Shuang

作者： Zhao, Shuang;Gao, Hanbing;Jia, Xumei;Ke, Mao;Ma, Fengwang;Wang, Haibo

作者机构：

关键词： Apple (Malusdomestica); MdHB-7; ABA; Stomata; Reactive oxygen species; Drought tolerance

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：5.545； 五年影响因子：5.99 ）

ISSN： 0098-8472

年卷期： 2020 年 180 卷

页码：

收录情况： SCI

摘要： Drought severely restricts global crop yield and quality. These limitations may be partially addressed through genetic engineering to improve crop drought tolerance. The HD-Zip I transcription factors play important roles in the regulation of plant drought tolerance, but their specific functions in the regulation of apple drought response remain unclear. In this study, we found that MdHB-7 was expressed at different levels in a variety of apple tissues and was significantly induced by abscisic acid (ABA) and drought stress treatments. To investigate the functions of MdHB-7, we created transgenic apple plants that exhibited either MdHB-7 overexpression or RNAi-induced MdHB-7 suppression. Through drought stress treatments and phenotypic assessments, we found that MdHB-7 expression enhanced the drought tolerance of apple plants. Overexpression of MdHB-7 promoted endogenous ABA accumulation, stomatal closure, and reactive oxygen species (ROS) detoxification in response to drought, whereas suppression of MdHB-7 expression had the opposite effect. Our results lay a foundation for further research on the mechanisms by which HD-Zip I proteins promote drought tolerance.

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