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Mycoviromic Analysis Unveils Complex Virus Composition in a Hypovirulent Strain of Sclerotinia sclerotiorum. J Fungi (Basel) 2022; 8:jof8070649. [PMID: 35887405 PMCID: PMC9317179 DOI: 10.3390/jof8070649] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/15/2022] [Accepted: 06/17/2022] [Indexed: 11/16/2022] Open
Abstract
Mycoviruses are ubiquitous in pathogenic fungi including Sclerotinia sclerotiorum. Using RNA sequencing, more mycoviruses have been identified in individual strains, which were previously reported to be infected by a single mycovirus. A hypovirulent strain of S. sclerotiorum, HC025, was previously thought to harbor a single mitovirus, Sclerotinia sclerotiorum mitovirus 1 (SsMV1), based on the analysis of the conventional dsRNA extraction method. We found HC025 to be co-infected by five mycoviruses. In addition to SsMV1, four mycoviruses were identified: Sclerotinia sclerotiorum narnavirus 4 (SsNV4), Sclerotinia sclerotiorum negative-stranded RNA virus 1 (SsNSRV1), Sclerotinia sclerotiorum ourmia-like virus 14 (SsOLV14), and SsOLV22. Three mycoviruses including SsNV4, SsNSRV1, and SsOLV14 share high replicase identities (more than 95%) with the previously reported corresponding mycoviruses, and SsOLV22 shows lower identity to the known viruses. The complete genome of SsOLV22 is 3987 nt long and contains a single ORF-encoded RdRp, which shares 24.84% identity with the RNA-dependent RNA polymerase (RdRp) of Hubei narna-like virus 10 (query coverage: 26%; e-value: 8 × 10−19). The phylogenetic tree of RdRp suggests that SsOLV22 is a new member within the family Botourmiaviridae. All of the mycoviruses except for SsNSRV1 could horizontally co-transfer from HC025 to the virulent strain Ep-1PNA367 with hypovirulent phenotypes, and converted a later strain into a hypovirulent strain. In summary, we molecularly characterized the hypovirulent strain HC025 and identified five RNA mycoviruses including a new member within Botourmiaviridae.
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Shuai S, Zheng H, Ding H, Wang Y, Li J, Liu F, Liu F, An H, Fang S, Zhang S, Deng Q. Molecular characterization of a novel botourmiavirus with inverted complementary termini from the rice blast fungus Magnaporthe oryzae isolate HF04. Arch Virol 2022; 167:1899-1903. [PMID: 35716263 DOI: 10.1007/s00705-022-05506-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Accepted: 05/09/2022] [Indexed: 11/29/2022]
Abstract
A novel positive-sense single-stranded RNA mycovirus, designated as "Magnaporthe oryzae botourmiavirus 10" (MoBV10), was identified in the rice blast fungus Magnaporthe oryzae isolate HF04. MoBV10 has a single genomic RNA segment consisting of 2,448 nucleotides, which contains a single open reading frame encoding an RNA-dependent RNA polymerase. Genome comparison and phylogenetic analysis indicated that MoBV10 is a new member of the genus Betascleroulivirus in the family Botourmiaviridae. The 5'- and 3'-terminal sequences of the genomic RNA of MoBV10 have inverted complementarity and potentially form a panhandle structure, which is very rare in RNA viruses.
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Affiliation(s)
- Simnin Shuai
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Hong Zheng
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Hang Ding
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Yao Wang
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Jinzhe Li
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Fuyu Liu
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Fengying Liu
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Hongliu An
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Shouguo Fang
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Songbai Zhang
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China
| | - Qingchao Deng
- College of Agriculture, Yangtze University, Jingzhou, 434005, Hubei, China. .,Hubei Engineering Research Center for Pest Forewarning and Management, Jingzhou, China.
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