期刊
VIRUS GENES
卷 -, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1007/s11262-023-02041-8
关键词
Mycovirus; Duamitovirus; Armillaria mellea; Root rot
Members of the genus Armillaria are known as one of the causative agents of white root rot in infected plants, but the existence of mitoviruses in this genus has not been reported. This study identified a new mitovirus, Armillaria mellea mitovirus 1 (AmMV1), in Armillaria mellea samples, marking the first known instance of a mitovirus in this genus.
Members of the genus Armillaria belong to the group of pathogenic and facultative saprotrophic fungi that are generally known as one of the causative agents of white root rot in infected plants including deciduous and evergreen trees and shrubs. Although several single-stranded RNA mycoviruses were previously described in different Armillaria species, there is no report on mitoviruses (one of the simplest RNA viruses of fungal hosts) known to infect Armillaria taxa. In this study, a new mitovirus denominated Armillaria mellea mitovirus 1 (AmMV1) was identified in the sporophore samples of Armillaria mellea, commonly known as honey mushroom. AmMV1 has a genome length of 4440 nucleotides and a G + C content of 48%. It encompasses a single open reading frame (ORF) that encodes an RNA-dependent RNA polymerase (RdRp). Comparison through BLASTp analysis revealed that the RdRp domain of AmMV1 shares a sequence identity ranging from 33.43% to 43.27% with RdRp domains of Duamitovirus genus members, having the highest similarity (43.27%) to Rhizoctonia solani mitovirus 94. According to phylogenetic analysis, AmMV1 is classified as a member of the genus Duamitovirus belonging to the Mitoviridae family. This marks the initial instance of a mitovirus identified in Armillaria spp..
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