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Molecular characterization of a novel polymycovirus identified in the phytopathogenic fungus Colletotrichum gloeosporioides

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Abstract

A novel polymycovirus isolated from the plant-pathogenic fungus Colletotrichum gloeosporioides was identified. The viral genome is composed of nine double-stranded RNA segments, ranging in size from 699 bp to 2,444 bp. With the exception of dsRNA5, which contains two open reading frames (ORF5-1 and ORF5-2), the other dsRNA segments each contain one ORF. The proteins encoded by ORFs 1–8 are homologous to the proteins encoded by ORFs 1–8 of Colletotrichum camelliae filamentous virus 1 (CcFV-1). The amino acid sequences of the RNA-dependent RNA polymerase (RdRp) encoded by ORF1 and the viral methyltransferase encoded by ORF3 share 87.6% and 83.3% identity with CcFV-1. The proline-alanine-serine-rich protein (PASrp) encoded by ORF4 shares 86.6% sequence identity with that of CcFV-1. The proteins encoded by ORFs 2, 5 − 1, 6, 7, and 8 share 86.6%, 82.5%, 89.0%, 45.7%, and 95.5% sequence identity, respectively, with the corresponding proteins of CcFV-1. dsRNA9 is a defective copy of dsRNA2 that lacks a stretch of 1556 bp (nt 519 to nt 2074). Phylogenetic analysis based on the RdRp protein indicated that the novel virus clustered with members of the family Polymycoviridae, and based on the above results, we have tentatively named it "Colletotrichum gloeosporioides polymycovirus virus 1" (CgPmV1). To our knowledge, this is the first report of a polymycovirus with a defective dsRNA genome in C. gloeosporioides.

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Funding

This research was supported by the Hunan Provincial Natural Science Foundation of China (2021JJ30356), Hunan Provincial Key Research and Development Program of China (2020NK2045), and Hunan Provincial Science and Technology Innovation Platform Construction Fund (20K071).

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Correspondence to Xinyu Zhou.

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Cao, J., Xie, F., Zhang, Z. et al. Molecular characterization of a novel polymycovirus identified in the phytopathogenic fungus Colletotrichum gloeosporioides. Arch Virol 167, 2805–2810 (2022). https://doi.org/10.1007/s00705-022-05591-8

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