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Dual impact of ambient humidity on the virulence of Magnaporthe oryzae and basal resistance in rice

文献类型： 外文期刊

作者： Qiu, Jiehua 1 ; Liu, Zhiquan 1 ; Xie, Junhui 2 ; Lan, Bo 3 ; Shen, Zhenan 1 ; Shi, Huanbin 1 ; Lin, Fucheng 4 ; Shen, Xiangling 2 ; Kou, Yanjun 1 ;

作者机构： 1.China Natl Rice Res Inst, State Key Lab Rice Biol, Hangzhou 311400, Peoples R China

2.China Three Gorges Univ, Biotechnol Res Ctr, Key Lab Three Gorges Reg Plant Genet & Germplasm, Yichang, Peoples R China

3.Jiangxi Acad Agr Sci, Inst Plant Protect, Nanchang, Jiangxi, Peoples R China

4.Zhejiang Acad Agr Sci, Inst Plant Protect & Microbiol, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou, Peoples R China

关键词： EIL1; EIN2; ethylene signalling; Oryza sativa; plant immunity; rice blast

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.947； 五年影响因子：8.452 ）

ISSN： 0140-7791

年卷期： 2022 年 45 卷 12 期

页码：

收录情况： SCI

摘要： Humidity is a critical environmental factor affecting the epidemic of plant diseases. However, it is still unclear how ambient humidity affects the occurrence of diseases in plants. In this study, we show that high ambient humidity enhanced blast development in rice plants under laboratory conditions. Furthermore, we found that high ambient humidity enhanced the virulence of Magnaporthe oryzae by promoting conidial germination and appressorium formation. In addition, the results of RNA-sequencing analysis and the ethylene content assessment revealed that high ambient humidity suppressed the accumulation of ethylene and the activation of ethylene signaling pathway induced by M. oryzae in rice. Knock out of ethylene signaling genes OsEIL1 and OsEIN2 or exogenous application of 1-methylcyclopropene (ethylene inhibitor) and ethephon (ethylene analogues) eliminated the difference of blast resistance between the 70% and 90% relative humidity conditions, suggesting that the activation of ethylene signaling contributes to humidity-modulated basal resistance against M. oryzae in rice. In conclusion, our results demonstrated that high ambient humidity enhances the virulence of M. oryzae and compromises basal resistance by reducing the activation of ethylene biosynthesis and signaling in rice. Results from this study provide cues for novel strategies to control rice blast under global environmental changes.

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