Seven putative mitoviral genomes, representing four species from three Sclerotinia sclerotiorum isolates, were fully sequenced. The genome lengths ranged from 2438 to 2815 nucleotides. The RNA-dependent RNA polymerase (RdRp) of one genome shared high amino acid (aa) sequence identity (98.5 %) with the previously described Sclerotinia sclerotiorum mitovirus 2 (SsMV2/NZ1) and was provisionally assigned the name SsMV2/14563. The RdRps of three of the genomes with closest aa sequence identity of 78.8-79.3 % to Sclerotinia sclerotiorum mitovirus 1 (SsMV1/KL1) were provisionally considered to represent a new species, and the corresponding virus was named Sclerotinia sclerotiorum mitovirus 5 (SsMV5/11691, SsMV5/14563 and SsMV5/Lu471). The remaining two novel genomes, for which the viruses were provisionally named Sclerotinia sclerotiorum mitovirus 6 (SsMV6/14563 and SsMV6/Lu471) and Sclerotinia sclerotiorum mitovirus 7 (SsMV7/Lu471), showed closest aa sequence identities to Sclerotinia sclerotiorum mitovirus 3 (SsMV3/NZ1; 57.5-57.8 %) and Cryphonectria cubensis mitovirus 1a (CcMV1a; 32 %), respectively. The RdRp proteins of all seven genomes contained the conserved aa sequence motifs (I-IV) previously reported for mitoviruses, and their 5′ and 3′ untranslated regions (UTRs) have the potential to fold into stem-loop secondary structures.
Archives of Virology – Springer Journals
Published: Nov 1, 2014
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