Glutathione-dependent induction of local and systemic defense against oxidative stress by exogenous melatonin in cucumber (Cucumis sativus L.)

文献类型： 外文期刊

第一作者： Li, Hao

作者： Li, Hao;He, Jie;Yang, Xiaozhen;Luo, Dan;Wei, Chunhua;Ma, Jianxiang;Zhang, Yong;Yang, Jianqiang;Zhang, Xian;Li, Xin

作者机构：

关键词： Cucumis sativus;glutathione;hydrogen peroxide;local;systemic defense;melatonin

期刊名称：JOURNAL OF PINEAL RESEARCH （ 影响因子：13.007； 五年影响因子：12.936 ）

ISSN： 0742-3098

年卷期： 2016 年 60 卷 2 期

页码：

收录情况： SCI

摘要： Melatonin is involved in defending against oxidative stress caused by various environmental stresses in plants. In this study, the roles of exogenous melatonin in regulating local and systemic defense against photooxidative stress in cucumber (Cucumis sativus) and the involvement of redox signaling were examined. Foliar or rhizospheric treatment with melatonin enhanced tolerance to photooxidative stress in both melatonin-treated leaves and untreated systemic leaves. Increased melatonin levels are capable of increasing glutathione (reduced glutathione [GSH]) redox status. Application of H2O2 and GSH also induced tolerance to photooxidative stress, while inhibition of H2O2 accumulation and GSH synthesis compromised melatonin-induced local and systemic tolerance to photooxidative stress. H2O2 treatment increased the GSH/oxidized glutathione (GSSG) ratio, while inhibition of H2O2 accumulation prevented a melatonin-induced increase in the GSH/GSSG ratio. Additionally, inhibition of GSH synthesis blocked H2O2-induced photooxidative stress tolerance, whereas scavenging or inhibition of H2O2 production attenuated but did not abolish GSH-induced tolerance to photooxidative stress. These results strongly suggest that exogenous melatonin is capable of inducing both local and systemic defense against photooxidative stress and melatonin-enhanced GSH/GSSG ratio in a H2O2-dependent manner is critical in the induction of tolerance.

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