Exogenous Melatonin Enhances Rice Plant Resistance Against Xanthomonas oryzae pv. oryzae

文献类型： 外文期刊

第一作者： Chen, Xian

作者： Chen, Xian;Liu, Fengquan;Chen, Xian;Laborda, Pedro;Liu, Fengquan

作者机构：

关键词： bacterial blight; melatonin; rice resistance; Xanthomonas oryzae pv. oryzae

期刊名称：PLANT DISEASE （ 影响因子：4.438； 五年影响因子：4.7 ）

ISSN： 0191-2917

年卷期： 2020 年 104 卷 6 期

页码：

收录情况： SCI

摘要： Rice bacterial blight (BB), caused by Xanthomonas oryzae pv. oryzae, is one of the most serious diseases of rice. In this study we found that exogenous melatonin can increase rice resistance to BB. Treatment of rice plants with exogenous melatonin (20 mu g/ml) increased nitrate reductase, nitric oxide synthase, and peroxidase activity, enabling high intracellular concentrations of melatonin, nitric oxide, and H2O2. The expression of NPR1, a key regulator in the salicylic acid signaling pathway, was upregulated more than 10-fold when the plants were challenged with melatonin. Similarly, the messenger RNA level of PDF1.2, a jasmonic acid-induced defense marker, was 15 times higher in the treated plants than in the control plants. Moreover, three pathogenesis-related proteins, PRIb, PR8a, and PR9, were upregulated 20-fold in the presence of melatonin. The application of melatonin (100 mu g/ml) to soil-grown rice reduced the incidence of BB by 86.21%. Taken together, these results not only provide a better understanding of melatonin-mediated innate immunity to X. oryzae pv. oryzae in rice but also represent a promising cultivation strategy to protect rice against X. oryzae pv. oryzae infection.

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