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A lipid droplet-associated protein Nem1 regulates appressorium function for infection of Magnaporthe oryzae

文献类型： 外文期刊

作者： Chen, Deng 1 ; Cai, Xuan 1 ; Xing, Junjie 3 ; Chen, Shen 4 ; Zhao, Juan 1 ; Qu, Zhiguang 1 ; Li, Guotian 1 ; Liu, Hao 1 ; Zheng, Lu 1 ; Huang, Junbin 1 ; Chen, Xiao-Lin 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Plant Sci & Technol, State Key Lab Agr Microbiol, Wuhan 430070, Peoples R China

2.Huazhong Agr Univ, Coll Plant Sci & Technol, Prov Key Lab Plant Pathol HubeiProvince, Wuhan, Peoples R China

3.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Peoples R China

4.Plant Protect Res Inst, Guangdong Acad Agr Sci, Guangdong Prov Key Lab High Technol Plant Protect, Guangzhou 510640, Peoples R China

关键词： Lipid biogenesis; TOR signaling; cAMP-PKA signaling; Conidium formation; Appressorium; Magnaporthe oryzae

期刊名称：ABIOTECH （ 影响因子：3.6； 五年影响因子：3.7 ）

ISSN： 2096-6326

年卷期： 2023 年 4 卷 2 期

页码：

收录情况： SCI

摘要： Lipid droplets are important storages in fungal conidia and can be used by plant pathogenic fungi for infection. However, the regulatory mechanism of lipid droplets formation and the utilization during fungal development and infection are largely unknown. Here, in Magnaporthe oryzae, we identified a lipid droplet-associated protein Nem1 that played a key role in lipid droplets biogenesis and utilization. Nem1 was highly expressed in conidia, but lowly expressed in appressoria, and its encoded protein was localized to lipid droplets. Deletion of NEM1 resulted in reduced numbers of lipid droplets and decreased content of diacylglycerol (DAG) or triacylglycerol (TAG). NEM1 was required for asexual development especially conidia production. The Delta nem1 mutant was nearly loss of virulence to host plants due to defects in appressorial penetration and invasive growth. Remarkably, Nem1 was regulated by the TOR signaling pathway and involved in the autophagy process. The Ser303 residue of Nem1 could be phosphorylated by the cAMP-PKA signaling pathway and was important for biological function of Nem1. Together, our study revealed a regulatory mechanism of lipid biogenesis and metabolism during the conidium and appressorium formation of the rice blast fungus.

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