Abstract
Neofusicoccum parvum is an important plant-pathogenic ascomycetous fungus that causes trunk diseases in a variety of plants. A limited number of reports on mycoviruses from this fungus are available. Here, we report the characterization of a novel victorivirus, Neofusicoccum parvum victorivirus 3 (NpVV3). An agarose gel dsRNA profile of a Pakistani strain of N. parvum, NFN, showed a band of ~5 kbp that was not detectable in Japanese strains of N. parvum. Taking a high-throughput and Sanger sequencing approach, the complete genome sequence of NpVV3 was determined to be 5226 bp in length with two open reading frames (ORF1 and ORF2) that encode a capsid protein (CP) and an RNA-dependent RNA polymerase (RdRP). The RdRP appears to be translated by a stop/restart mechanism facilitated by the junction sequence AUGucUGA, as is found in some other victoriviruses. BLASTp searches showed that NpVV3 CP and RdRP share the highest amino acid sequence identity (80.5% and 72.4%, respectively) with the corresponding proteins of NpVV1 isolated from a French strain of N. parvum. However, NpVV3 was found to be different from NpVV1 in its terminal sequences and the stop/restart facilitator sequence. NpVV3 particles ~35 nm in diameter were partially purified and used to infect an antiviral-RNA-silencing-deficient strain (∆dcl2) of an experimental ascomycetous fungal host, Cryphonectria parasitica. NpVV3 showed symptomless infection in the new host strain.
Sequence data availability
The complete genomic nucleotide sequence of Neofusicoccum parvum victorivirus 3-NFN (NpVV3-NFN) was deposited in the GenBank/ENA/DDBJ database under accession number MZ868719.
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Acknowledgements
HAK is thankful to the Higher Education Commission (HEC) of Pakistan for a fellowship under the International Research Support Initiative Program (IRSIP). YS is a JSPS (Japan Society for the Promotion of Science) fellow. The authors are grateful to Dr. Donald L. Nuss for the generous gift of C. parasitica strain ∆dcl2. The authors are also grateful to Dr. Sabitree Shahi and Ms. Sakae Hisano for technical assistance.
Funding
This study was supported in part by Yomogi Inc., the Ohara Foundation for Agriculture Research (to NS), and Grants-in-Aid for Scientific Research on Innovative Areas from the Japanese Ministry of Education, Culture, Sports, Science and Technology (KAKENHI 21H05035, 17H01463, 16H06436, 16H06429 and 16K21723 to N.S. and H.K.). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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705_2021_5304_MOESM1_ESM.pdf
Supplementary Fig. S1 Multiple alignment of the amino acid sequences of the conserved motifs in RdRps of NpVV3 and other victoriviruses. Virus names and abbreviations are as follows: NpVV3, Neofusicoccum parvum victorivirus 3 (accession no. MZ868719); NpVV1, Neofusicoccum parvum victorivirus 1 (accession no. QTE76048.1); RnVV1, Rosellinia necatrix victorivirus 1 (accession no. YP_008130308.1); UvRV1, Ustilaginoidea virens RNA virus 1 (accession no.YP_007761589.1); MpVV1, Macrophomina phaseolina victorivirus 1 (accession no. QKI37143.1); PlTV1, Phomopsis longicolla totivirus 1 (accession no. ALD89108.1); AaVV1, Alternaria arborescens victorivirus 1 (accession no. YP_009553478.1); CmRV, Coniothyrium minitans RNA virus (accession no. YP_392467.1); PdV1, Penicillium digitatum virus 1 (accession no. AMY26886.1); MoV2, Magnaporthe oryzae virus 2 (accession no. BBG92298.1); SsRV2, Sphaeropsis sapinea RNA virus 2 (accession no. NP_047560.1); UvRV1, Ustilaginoidea virens RNA virus 1 (accession no. YP_007761589.1) (PDF 597 KB)
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Khan, H.A., Sato, Y., Kondo, H. et al. A novel victorivirus from the phytopathogenic fungus Neofusicoccum parvum. Arch Virol 167, 923–929 (2022). https://doi.org/10.1007/s00705-021-05304-7
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DOI: https://doi.org/10.1007/s00705-021-05304-7