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  • Title: Molecular characterization of two positive-strand RNA viruses co-infecting a hypovirulent strain of Sclerotinia sclerotiorum.
    Author: Hu Z, Wu S, Cheng J, Fu Y, Jiang D, Xie J.
    Journal: Virology; 2014 Sep; 464-465():450-459. PubMed ID: 25104554.
    Abstract:
    Two dsRNA segments, the replicative forms of two ssRNA viruses of SsHV2/SX247 (Sclerotinia sclerotiorum hypovirus 2) and SsDRV/SX247 (Sclerotinia sclerotiorum debilitation-associated RNA virus), were isolated from the hypovirulent strain SX247 of Sclerotinia sclerotiorum. SsDRV/SX247 has the highest similarities (81% aa identity) with the previously reported virus SsDRV/Ep-1PN. The genome of SsHV2/SX247 is 15,219bp in length with a poly-A tail, and it has only one large putative open reading frame (ORF) that encodes a polyprotein containing RNA-dependent RNA polymerase (RdRp) and viral RNA helicase domains. The RdRp domain shares amino acid similarity with that of CHV1 (23%). However, the genome organization of SsHV2/SX247 is significantly different from that of CHV1 on genomic size and ORFs. We conclude that SsDRV/SX247 is a novel strain in species SsDRV of genus Sclerodarnavirus, whereas SsHV2/SX247 is a representative member of new proposed lineage Gammahypovirus in the family Hypoviridae and confers hypovirulence in its host.
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