Transcription factors Vrf1 and Hox7 coordinately regulate appressorium maturation in the rice blast fungus Magnaporthe oryzae

文献类型： 外文期刊

第一作者： Huang, Pengyun

作者： Huang, Pengyun;Wang, Jing;Li, Yan;Wang, Qing;Huang, Zhicheng;Lu, Jianping;Qian, Hui;Liu, Xiao-Hong;Lin, Fu-Cheng;Lin, Fu-Cheng

作者机构：

关键词： Pyricularia oryzae; Appressorium formation; Melanin; Cell wall; Gene expression profiles; Cell cycle

期刊名称：MICROBIOLOGICAL RESEARCH （ 影响因子：5.07； 五年影响因子：7.103 ）

ISSN： 0944-5013

年卷期： 2022 年 263 卷

页码：

收录情况： SCI

摘要： Magnaporthe oryzae infects rice, wheat and other grass crops through appressoria. The formation of the appressorium is regulated by the external environment, signal transduction pathways, and transcription factors. Transcription factors Vrf1 and Hox7 are involved in the regulation of appressorium formation. In this study, we demonstrate that Vrf1 and Hox7 play vital roles in coordinately regulating appressorium maturation. In strain 70-15, deletion of VRF1 resulted in the inability to continue melanization and maturation of the incipient appressorium, and deletion of HOX7 also resulted in defects in appressorium melanization and maturation. The defects in appressorium formation in Delta hox7 Delta vrf1 were similar to those in Delta hox7 and Delta vrf1. The gene expression profiles of the incipient appressoria at 5 h post-inoculation (hpi) showed that the expression levels of 704 genes (25.94 % of all differentially expressed genes in the three mutants) were significantly downregulated (606 genes) or upregulated (98 genes). In the appressoria of Delta hox7, Delta vrf1, and Delta hox7 Delta vrf1 at 5 hpi, the expression level of genes related to cell wall remodeling was changed. Genes for melanin synthesis, chitin and glucan degradation, and extracellular cell wall degrading enzyme were significantly downregulated, while genes for chitin and glucan synthesis were upregulated. After 8 hpi, the incipient appressoria of Delta hox7, Delta vrf1, and Delta hox7 Delta vrf1 regerminated and formed swollen hyphal-like structures with multiple nuclei. The ratio of the nuclear number of the hyphal-like structures of Delta hox7, Delta hox7 Delta vrf1, and Delta vrf1 was close to 6:4:2 at 24 hpi. Therefore, although Vrf1 and Hox7 are somewhat functionally different, they synergistically regulate appressorium maturation in M. oryzae.

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