Genome characterization of a novel narnavirus infecting the plant-pathogenic fungus Ustilaginoidea virens
文献类型： 外文期刊
作者： He, Zhenrui 1 ; Zhao, Wenhua 1 ; Fan, Yu 1 ; Wang, Li 1 ; Yang, Mei 1 ; Yang, Yingqing 2 ; Zhou, Erxun 1 ;
作者机构： 1.South China Agr Univ, Coll Plant Protect, Guangdong Prov Key Lab Microbial Signals & Dis Con, Guangzhou 510642, Peoples R China
2.Jiangxi Acad Agr Sci, Inst Plant Protect, Nanchang 330200, Peoples R China
期刊名称：ARCHIVES OF VIROLOGY （ 影响因子：2.7； 五年影响因子：2.4 ）
ISSN： 0304-8608
年卷期： 2024 年 169 卷 4 期
页码：
收录情况： SCI
摘要： Mycoviruses are viruses that infect fungi and oomycetes. They are widespread in all major groups of plant-pathogenic fungi and oomycetes. To date, only the full genome of dsRNA mycoviruses and the contigs of positive-sense single-stranded RNA (+ssRNA) mycoviruses have been reported in Ustilaginoidea virens, which is the notorious causal agent of rice false smut (RFS). Here, we report the molecular characterization of a novel +ssRNA mycovirus, Ustilaginoidea virens narnavirus 4 (UvNV4), isolated from U. virens strain Uv418. UvNV4 has a genome of 3,131 nucleotides (nt) and possesses an open reading frame (ORF) predicted to encode an RNA-dependent RNA polymerase (RdRp) of 1,017 amino acids (aa) sequence with a molecular mass of 116.6 kDa. BLASTp analysis revealed that the RdRp showed 50.34% aa sequence identity to that of the previously described Zhangzhou Narna tick virus 1. Phylogenetic analysis indicated that UvNV4 is closely related to members of the family Narnaviridae. Taken together, these results clearly demonstrate that UvNV4 is a novel +ssRNA virus infecting U. virens.
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