Autophagy-related protein UvAtg14 contributes to mycelial growth, asexual reproduction, virulence and cell stress response in rice false smut fungus Ustilaginoidea virens

Phytopathology Research(2022)

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摘要
Autophagy is an evolutionarily conserved degradation process that degrades damaged proteins to maintain homeostasis and to protect cells against stress. In this study, we identified and characterized a critical autophagy-related protein, UvAtg14, in Ustilaginoidea virens , which is the ortholog of MoAtg14 in rice blast fungus Magnaporthe oryzea . UvAtg14 is co-localized with UvAtg8 (an autophagy marker protein) and is highly expressed at 1–3 days post-inoculation. Deletion of the UvATG14 gene blocked GFP-UvAtg8 trafficking and autophagic digestion and significantly reduced mycelial growth, asexual reproduction, and virulence of U. virens . UvATG14 deletion mutants also exhibited increased sensitivity to various abiotic stresses. Our findings indicate that UvAtg14 is a key autophagic protein and contributes to mycelial growth, conidia production, and pathogenicity in U. virens .
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关键词
Ustilaginoidea virens,Autophagy,UvAtg14,Mycelial growth,Conidium,Chlamydospore,Pathogenicity
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