Endogenous salicylic acid accumulation is required for chilling tolerance in cucumber (Cucumis sativus L.) seedlings

文献类型： 外文期刊

第一作者： Dong, Chun-Juan

作者： Dong, Chun-Juan;Li, Liang;Shang, Qing-Mao;Liu, Xin-Yan;Zhang, Zhi-Gang

作者机构：

关键词： Cucumis sativus;Chilling;Salicylic acid;Hydrogen peroxide;Inhibitor

期刊名称：PLANTA （ 影响因子：4.116； 五年影响因子：4.316 ）

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收录情况： SCI

摘要： Salicylic acid (SA) is an important plant hormone, and its exogenous application can induce tolerance to multiple environmental stresses in plants. In this study, we examine the potential involvement of endogenous SA in response to chilling in cucumber (Cucumis sativus L.) seedlings. A low temperature of 8 °C induces a moderate increase in endogenous SA levels. Chilling stimulates the enzymatic activities and the expression of genes for phenylalanine ammonia-lyase (PAL) and benzoic acid-2-hydroxylase rather than isochorismate synthase. This indicates that the PAL enzymatic pathway contributes to chilling-induced SA production. Cucumber seedlings pretreated with SA biosynthesis inhibitors accumulate less endogenous SA and suffer more from chilling damage. The expression of cold-responsive genes is also repressed by SA inhibitors. The reduction in stress tolerance and in gene expression can be restored by the exogenous application of SA, confirming the critical roles of SA in chilling responses in cucumber seedlings. Furthermore, the inhibition of SA biosynthesis under chilling stress results in a prolonged and enhanced hydrogen peroxide (H_2O_2) accumulation. The application of exogenous SA and the chemical scavenger of H_2O_2 reduces the excess H_2O_2 and alleviates chilling injury. In contrast, the protective effects of SA are negated by foliar spraying with high concentrations of H_2O_2 and an inhibitor of the antioxidant enzyme. These results suggest that endogenous SA is required in response to chilling stress in cucumber seedlings, by modulating the expression of cold-responsive genes and the precise induction of cellular H_2O_2 levels.

分类号： Q94

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