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Two Novel Hypovirulence-Associated Mycoviruses in the Phytopathogenic Fungus Botrytis cinerea: Molecular Characterization and Suppression of Infection Cushion Formation
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Viruses 2018, 10(8), 432;

Molecular Characterization and Geographic Distribution of a Mymonavirus in the Population of Botrytis cinerea

1,2,* and 1,2
The State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
The Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan 430070, China
Author to whom correspondence should be addressed.
Received: 24 July 2018 / Revised: 12 August 2018 / Accepted: 14 August 2018 / Published: 15 August 2018
(This article belongs to the Special Issue Mycoviruses)
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Here, we characterized a negative single-stranded (−ss)RNA mycovirus, Botrytis cinerea mymonavirus 1 (BcMyV1), isolated from the phytopathogenic fungus Botrytis cinerea. The genome of BcMyV1 is 7863 nt in length, possessing three open reading frames (ORF1–3). The ORF1 encodes a large polypeptide containing a conserved mononegaviral RNA-dependent RNA polymerase (RdRp) domain showing homology to the protein L of mymonaviruses, whereas the possible functions of the remaining two ORFs are still unknown. The internal cDNA sequence (10-7829) of BcMyV1 was 97.9% identical to the full-length cDNA sequence of Sclerotinia sclerotiorum negative stranded RNA virus 7 (SsNSRV7), a virus-like contig obtained from Sclerotinia sclerotiorum metatranscriptomes, indicating BcMyV1 should be a strain of SsNSRV7. Phylogenetic analysis based on RdRp domains showed that BcMyV1 was clustered with the viruses in the family Mymonaviridae, suggesting it is a member of Mymonaviridae. BcMyV1 may be widely distributed in regions where B. cinerea occurs in China and even over the world, although it infected only 0.8% of tested B. cinerea strains. View Full-Text
Keywords: Botrytis cinerea; Botrytis cinerea mymonavirus 1; Mymonaviridae Botrytis cinerea; Botrytis cinerea mymonavirus 1; Mymonaviridae

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Hao, F.; Wu, M.; Li, G. Molecular Characterization and Geographic Distribution of a Mymonavirus in the Population of Botrytis cinerea. Viruses 2018, 10, 432.

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