Sulfur dioxide enhances the resistance of postharvest grape berries to gray mold through hydrogen peroxide signaling

文献类型： 外文期刊

第一作者： Xing, Shijun

作者： Xing, Shijun;Tian, Quanming;Zhang, Yu;Zheng, Yige;Yuan, Yuyao;Zhang, Zheng;Zhang, Hao;Wei, Jia;Wu, Bin

作者机构：

关键词： Postharvest grape berries; Botrytis cinerea resistance; H 2 O 2 signaling; Antioxidant system

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：6.8； 五年影响因子：7.5 ）

ISSN： 0925-5214

年卷期： 2025 年 221 卷

页码：

收录情况： SCI

摘要： Gray mold, caused by Botrytis cinerea, presents a serious problem to the table grape industry. Sulfur dioxide (SO2) can protect berries from pathogenic fungal infections by exerting biological functions, but the underlying mechanisms remain largely unknown. To investigate the mechanism by which SO2 enhances postharvest grape disease resistance through reactive oxygen species (ROS) pathway, grapes were fumigated with SO2 (500 mu L L- 1) and then inoculated with B. cinerea. The results showed that SO2 effectively inhibited the expansion of B. cinerea on postharvest grapes. SO2 promoted the transient production of superoxide anions and hydrogen peroxide (H2O2) during the initial stage (in the first 9 h) by rapidly increasing the enzyme activities and gene expression of respiratory burst oxidase homologs and superoxide dismutase. From 1-7 d, the ROS and malondialdehyde levels were significantly reduced by SO2. Further analysis showed that SO2 can boost the antioxidant capacity of berries (total antioxidant capacity, and ABTS and DPPH scavenging capacities) by promoting ROS scavenging enzyme activities and the ascorbate-glutathione (AsA-GSH) cycle. In addition, the expression of ROS scavenging-related, AsA-GSH cycle-related genes, and VvPRs was effectively upregulated by SO2. Together with correlation analysis results, we propose that the initial H2O2 signal contributes to improved antioxidant capacity and upregulation of VvPRs, which plays a crucial role in strengthening the long-term resistance of postharvest grapes to B. cinerea. In conclusion, SO2 can enhance postharvest grape resistance to gray mold by leveraging the H2O2 signaling pathway, highlighting its pivotal role in activating the defense mechanisms of plants.

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