Abstract CO is a gas signal molecule involved in various physiological and metabolic regulation processes in plants. In the present study, we evaluated the effects of CO fumigation on the control of Alternaria rot in jujube fruit and explored the mechanism of action. Results showed that CO at 10 μmol L−1 significantly reduced lesion diameter in the fruit inoculated with A. alternata without showing any antifungal activity in vitro. CO treatment enhanced the activities of four representative resistance-related enzymes (phenylalanine ammonia-lyase, polyphenol oxidase, chitinase, and β-1,3-glucanase). Furthermore, CO also led to increase in the content of phenolics, flavonoids, lignin, and H2O2. These results indicate that CO induces resistance to Alternaria rot primarily by activating disease resistance-related enzymes and enhancing accumulation of antifungal substances, and that CO can be a promising elicitor of plant defense responses to resist Alternaria rot in postharvest jujube fruit.

中文翻译：

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一氧化碳增强枣果实对采后链格孢腐病的抗性

摘要 CO是一种气体信号分子，参与植物的各种生理代谢调控过程。在本研究中，我们评估了 CO 熏蒸对控制枣果实链格孢腐烂的影响并探讨了作用机制。结果表明，10 μmol L-1 的 CO 显着降低了接种 A. alternata 的果实的病斑直径，但在体外没有表现出任何抗真菌活性。CO 处理增强了四种代表性的抗性相关酶（苯丙氨酸解氨酶、多酚氧化酶、几丁质酶和 β-1,3-葡聚糖酶）的活性。此外，CO 还导致酚类、黄酮类、木质素和 H2O2 含量的增加。