Rice blast disease is one of the most common rice diseases worldwide. It is essential to improve disease resistance through environment-friendly methods, while maintaining yield and quality parameters. In this study, jasmonic acid (JA), a plant hormone with anti-fungal activity, was obtained, at both low (100 μmol/L) and high (400 μmol/L) concentrations in rice leaves, before, during, and after infection, respectively. JA could inhibit germination and appressorium formation of rice blast spores in a dose-dependent manner. A total of 400-μmol/L JA treatment significantly enhanced cell viability and endogenous JA level in rice leaves. Furthermore, rice leaves inoculated with Magnaporthe oryzae and sprayed with JA 72 h post-inoculation showed the maximum symptom relief and the highest endogenous JA production among all treatment approaches. The expressions of defense-related genes, OsPR10a and OsAOS2, were highly up-regulated in response to JA, whereas OsEDS1 was down-regulated. Hence, we revealed that exogenous JA could activate JA signaling to effectively control the symptoms of rice blast.

中文翻译：

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茉莉酸在稻瘟病菌感染可见褐色坏死斑阶段的应用作为一种新型环保的稻瘟病防治策略

稻瘟病是世界范围内最常见的水稻病害之一。必须通过环境友好的方法提高抗病性，同时保持产量和质量参数。在这项研究中，茉莉酸 (JA) 是一种具有抗真菌活性的植物激素，在水稻叶片中、之前、期间和之后分别以低 (100 μmol/L) 和高 (400 μmol/L) 浓度获得。分别感染。JA可以以剂量依赖的方式抑制稻瘟病孢子的萌发和附着物形成。400-μmol/L JA处理显着提高了水稻叶片的细胞活力和内源性JA水平。此外，接种稻瘟病菌并在接种后 72 小时喷洒 JA 的水稻叶片在所有处理方法中表现出最大的症状缓解和最高的内源 JA 产量。防御相关基因 OsPR10a 和 OsAOS2 的表达响应 JA 高度上调，而 OsEDS1 下调。因此，我们揭示了外源 JA 可以激活 JA 信号以有效控制稻瘟病的症状。