Abstract
Here, we report a novel mycotombus-like mycovirus, tentatively named "Phoma matteucciicola RNA virus 2" (PmRV2), derived from the phytopathogenic fungus Phoma matteucciicola strain HNQH1. The complete PmRV2 genome is comprised of a positive-sense single-stranded RNA (+ssRNA) of 3,460 nucleotides (nt) with a GC content of 56.71%. Sequence analysis of PmRV2 indicated the presence of two noncontiguous open reading frames (ORFs) encoding a hypothetical protein and an RNA-dependent RNA polymerase (RdRp), respectively. PmRV2 contains a metal-binding ‘GDN’ triplet in motif C of RdRp, while most +ssRNA mycoviruses contained a ‘GDD’ motif in the same region. A BLASTp search showed that the RdRp amino acid sequence of PmRV2 was most closely related to the RdRp of Macrophomina phaseolina umbra-like virus 1 (50.72% identity) and Erysiphe necator umbra-like virus 2 (EnUlV2, 44.84% identity). Phylogenetic analysis indicated that PmRV2 grouped together with EnUlV2 within the recently proposed family "Mycotombusviridae".
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Funding
This study was financially supported by Hainan Province Key R&D Project (No. ZDYF2022XDNY242), the National Natural Science Foundation of China (No. 32260648), the Scientific Research Foundation for Advanced Talents, Hainan University (No. KYQD(ZR)1873), the Leading Talent Project of Main Discipline Leaders in Jiangxi Province (No. 20213BCJL22046), and the Key Projects of Jiangxi Natural Science Foundation (No. 20202ACBL205006).
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Zhou, S., Chen, D., Fu, Y. et al. Characterization of a novel mycotombus-like virus from the plant-pathogenic fungus Phoma matteucciicola. Arch Virol 168, 103 (2023). https://doi.org/10.1007/s00705-023-05714-9
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DOI: https://doi.org/10.1007/s00705-023-05714-9