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<p>Wheat leaf rust is caused by the obligate biotrophic fungus <i>Puccinia triticina</i> f. sp. <i>tritici</i>, which seriously affects wheat production. In this study, a novel mitovirus was identified in <i>Puccinia triticina</i> strain HN-1 and designated as "Puccinia triticina mitovirus 1" (PtMV1). The genome of PtMV1 consists of a single RNA molecule with a length of 2,380 nt and an A + U content of 54.7% that contains a single open reading frame (ORF). The ORF is predicted to encode a putative RNA-dependent RNA polymerase (RdRp) of 653 amino acids with a molecular mass of 74.77 kDa, containing six conserved motifs. The RdRp amino acid sequence of PtMV1 has a high degree of sequence similarity to the RdRps of unuamitoviruses. Phylogenetic analysis indicated that PtMV1 is a new member of the genus <i>Unuamitovirus</i> within the family <i>Mitoviridae</i>. To our knowledge, this is the first report of a fungal virus in <i>Puccinia triticina.</i></p>

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Complete genome sequence of a novel mitovirus identified in the phytopathogenic fungus Puccinia triticina

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Yanhui Zhang,
  • Nuoheng Wang,
  • Jinyang Li,
  • Bingtao Chen,
  • Zhensheng Kang,
  • Pengyu Song,
  • Wenming Zheng

摘要

Wheat leaf rust is caused by the obligate biotrophic fungus Puccinia triticina f. sp. tritici, which seriously affects wheat production. In this study, a novel mitovirus was identified in Puccinia triticina strain HN-1 and designated as "Puccinia triticina mitovirus 1" (PtMV1). The genome of PtMV1 consists of a single RNA molecule with a length of 2,380 nt and an A + U content of 54.7% that contains a single open reading frame (ORF). The ORF is predicted to encode a putative RNA-dependent RNA polymerase (RdRp) of 653 amino acids with a molecular mass of 74.77 kDa, containing six conserved motifs. The RdRp amino acid sequence of PtMV1 has a high degree of sequence similarity to the RdRps of unuamitoviruses. Phylogenetic analysis indicated that PtMV1 is a new member of the genus Unuamitovirus within the family Mitoviridae. To our knowledge, this is the first report of a fungal virus in Puccinia triticina.