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  • Title: Full genome sequence of a new mitovirus from the phytopathogenic fungus Rhizoctonia solani.
    Author: Li S, Li Y, Hu C, Han C, Zhou T, Zhao C, Wu X.
    Journal: Arch Virol; 2020 Jul; 165(7):1719-1723. PubMed ID: 32424446.
    Abstract:
    A double-stranded RNA (dsRNA) segment was identified in Rhizoctonia solani anastomosis group (AG)-2-2IIIB, the primary causal agent of Rhizoctonia crown and root rot of sugar beet. The dsRNA segment represented the genome replication intermediate of a new mitovirus that was tentatively designated as "Rhizoctonia solani mitovirus 39" (RsMV-39). The complete sequence of the dsRNA was 2805 bp in length with 61.9% A+U content. Using either the fungal mitochondrial or universal genetic code, a protein of 840 amino acids containing an RNA-dependent RNA polymerase (RdRp) domain was predicted with a molecular mass of 94.46 kDa. BLASTp analysis revealed that the RdRp domain of RsMV-39 had 43.55% to 72.96% sequence identity to viruses in the genus Mitovirus, and was the most similar (72.96% identical) to that of Ceratobasidium mitovirus A (CbMV-A). Phylogenetic analysis based on RdRp domains clearly showed that RsMV-39 is a member of a distinct species in the genus Mitovirus of the family Mitoviridae. This is the first full genome sequence of a mycovirus associated with R. solani AG-2-2IIIB.
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