Abstract Salicylic acid (SA) is a crucial endogenous signaling molecule which can activate fruit defense responses to biotic or abiotic stress. The aim of this work was to study the effects of SA on disease occurrence, cell membrane integrity, membrane lipid-degrading enzymes activities, as well as amounts of cell membrane phospholipids and fatty acids in Phomopsis longanae Chi-inoculated longans during storage. The results indicated that, compared with the fruit with mere inoculation, SA treatment reduced fruit disease index and pericarp cell membrane permeability in P. longanae-inoculated longans. Additionally, SA treatment decreased activities of phospholipase D (PLD), phospholipase C (PLC), lipase, and lipoxygenase (LOX), lowered contents of saturated fatty acids (SFAs), phosphatidic acid (PA) and diacylglycerol (DAG), but suppressed the reductions of phosphatidylcholine (PC), phosphatidylinositol (PI), unsaturated fatty acids (USFAs), ratio of USFAs to SFAs (U/S), and index of unsaturated fatty acids (IUFA) in pericarp of P. longanae-inoculated longans. These data demonstrated that SA treatment could retain integrity of membrane structures, enhance fruit disease resistance to P. longanae, and thus suppress disease development in P. longanae-inoculated longans during storage. These results indicated that SA was an eco-friendly approach to inhibit disease development and extend storage-life of harvested longan fruit.

中文翻译：

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水杨酸处理通过调节膜脂代谢抑制 Phomopsis longanae Chi 诱导的龙眼果实采后病害发展

摘要 水杨酸（SA）是一种重要的内源性信号分子，可以激活果实对生物或非生物胁迫的防御反应。这项工作的目的是研究 SA 对疾病发生、细胞膜完整性、膜脂降解酶活性以及 Phomopsis longanae Chi 接种的龙眼在储存过程中的细胞膜磷脂和脂肪酸含量的影响。结果表明，与单纯接种龙眼相比，SA处理降低了龙眼龙眼的果实病害指数和果皮细胞膜通透性。此外，SA 处理降低了磷脂酶 D (PLD)、磷脂酶 C (PLC)、脂肪酶和脂肪氧化酶 (LOX) 的活性，降低了饱和脂肪酸 (SFA)、磷脂酸 (PA) 和甘油二酯 (DAG) 的含量，但抑制了接种龙眼果皮中磷脂酰胆碱 (PC)、磷脂酰肌醇 (PI)、不饱和脂肪酸 (USFA)、USFA 与 SFA 之比 (U/S) 和不饱和脂肪酸指数 (IUFA) 的减少龙眼。这些数据表明，SA 处理可以保持膜结构的完整性，增强果实对龙眼的抗病能力，从而抑制龙眼接种龙眼在储存过程中的病害发展。这些结果表明，SA 是一种生态友好的方法，可以抑制已收获的龙眼果实的病害发展并延长其储藏期限。这些数据表明，SA 处理可以保持膜结构的完整性，增强果实对龙眼的抗病能力，从而抑制龙眼接种龙眼在储存过程中的病害发展。这些结果表明，SA 是一种生态友好的方法，可以抑制已收获的龙眼果实的病害发展并延长其储藏期限。这些数据表明，SA 处理可以保持膜结构的完整性，增强果实对龙眼的抗病能力，从而抑制龙眼接种龙眼在储存过程中的病害发展。这些结果表明，SA 是一种生态友好的方法，可以抑制已收获的龙眼果实的病害发展并延长其储藏期限。