Secreted protein MoHrip2 is required for full virulence of Magnaporthe oryzae and modulation of rice immunity

文献类型： 外文期刊

第一作者： Zhang, Lin

作者： Zhang, Lin;Zhuang, Huiqian;Yang, Xiufen;Qiu, Dewen;Zeng, Hongmei

作者机构：

关键词： Magnaporthe oryzae; MoHrip2; Expression pattern; Localization; Virulence

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：4.813； 五年影响因子：4.697 ）

ISSN： 0175-7598

年卷期： 2019 年 103 卷 15 期

页码：

收录情况： SCI

摘要： MoHrip2, identified from Magnaporthe oryzae as an elicitor, can activate plant defense responses either in the form of recombinant protein in vitro or ectopic expressed protein in rice. However, its intrinsic function in the infective interaction of M. oryzae-rice is largely unknown. Here, we found that mohrip2 expression was significantly induced at stages of fungal penetration and colonization. Meanwhile, the induced MoHrip2 mainly accumulated in the rice apoplast by outlining the entire invasive hyphae during infection, and its secretion was via the conventional endoplasmic reticulum (ER)-to-Golgi pathway, demonstrating the nature of MoHrip2 as an apoplastic effector. What's more, the disease facilitating function of MoHrip2 was revealed by the significantly compromised virulence of Delta mohrip2 mutants on rice seedlings and even on the wounded rice leaves. Inoculations of these mutant strains on rice leaf sheaths showed a reduction in penetration and subsequent expansion of fungal growth, which is probably due to activated host immunity including the expression of certain defense-related genes and the production of certain phytoalexins. Altogether, these results demonstrated the necessity of MoHrip2 in suppression of host immunity and the full virulence of M. oryzae.

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