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<p><i>Metarhizium acridum</i> is a well-established specialist entomopathogenic fungus that primarily targets arthropods within the order Orthoptera. In this study, we investigated the genomic characteristics of a novel mycovirus infecting <i>M. acridum</i>, named “Metarhizium acridum unirnavirus 1” (MaUV1). Its genome is 2,907 bp in length and contains two open reading frames (ORFs), encoding a protein of unknown function and an RNA-dependent RNA polymerase. The identified ORFs showed sequence similarity to those of <i>“</i>Botryosphaeria dothidea non-segmented dsRNA mycovirus” and “Nigrospora oryzae mycovirus 1”. Phylogenetic analysis revealed that MaUV1 belongs to the recently established genus <i>Unirnavirus</i>, family <i>Amalgaviridae</i>. This is the first report of an amalgavirus infecting a member of the genus <i>Metarhizium</i> and the first report of a mycovirus infecting <i>M. acridum</i>.</p>

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Genomic characterisation of a novel unirnavirus isolated from the entomopathogenic fungus Metarhizium acridum

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Matheus da Silva Camargo,
  • Lucas Wisnieswski,
  • Ítalo Lasch,
  • Eduardo Pilar Gonçalves,
  • Ioly Kotta-Loizou,
  • Augusto Schrank

摘要

Metarhizium acridum is a well-established specialist entomopathogenic fungus that primarily targets arthropods within the order Orthoptera. In this study, we investigated the genomic characteristics of a novel mycovirus infecting M. acridum, named “Metarhizium acridum unirnavirus 1” (MaUV1). Its genome is 2,907 bp in length and contains two open reading frames (ORFs), encoding a protein of unknown function and an RNA-dependent RNA polymerase. The identified ORFs showed sequence similarity to those of “Botryosphaeria dothidea non-segmented dsRNA mycovirus” and “Nigrospora oryzae mycovirus 1”. Phylogenetic analysis revealed that MaUV1 belongs to the recently established genus Unirnavirus, family Amalgaviridae. This is the first report of an amalgavirus infecting a member of the genus Metarhizium and the first report of a mycovirus infecting M. acridum.