VvNAC33 functions as a key regulator of drought tolerance in grapevine by modulating reactive oxygen species production

文献类型： 外文期刊

第一作者： Xu, Na

作者： Xu, Na;Ma, Xiaoxuan;Ayiguzeli, Mohabaiti;Mei, Xindi;Xu, Na;Zhang, Songlin;Zhou, Xiaoming;Ma, Xiaoxuan;Zhong, Haixia;Zhang, Fuchun;Zhang, Chuan;Yadav, Vivek;Wu, Xinyu

作者机构：

关键词： Drought stress; Grapevine; Reactive oxygen species; Transcriptome; VvNAC33

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：5.7； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2025 年 224 卷

页码：

收录情况： SCI

摘要： Grapevine (Vitis vinifera L. and other Vitis spp.) is an important economic crop, but its yield and quality are severely affected by drought stress. NAC transcription factors, which play key roles in plant stress responses, have remained largely unexplored in grapevine drought tolerance. This study identified VvNAC33 as a droughtresponsive candidate gene through transcriptomic analysis and demonstrated its role as a positive regulator of drought tolerance. VvNAC33 expression was significantly upregulated under drought stress. Subcellular localization and transcriptional activity analyses confirmed its nuclear localization and transcriptional activation potential. Overexpression of VvNAC33 in Arabidopsis thaliana and transient overexpression in grapevine enhanced drought tolerance, whereas virus-induced gene silencing increased drought sensitivity. This enhanced tolerance was associated with the activation of the antioxidant defense system, including superoxide dismutase, peroxidase, and catalase, which promoted reactive oxygen species scavenging and alleviated oxidative damage. The enhanced expression of VvCAT1, VvCu/ZnSOD, and VvPOD4 by VvNAC33 highlights its crucial role in regulating antioxidant gene expression under drought stress. These findings strongly support the role of VvNAC33 in drought tolerance and identify it as a potential molecular target for enhancing drought resistance in grapevine.

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