New Zealand isolates of the entomopathogenic fungus Beauveria were examined for the presence of dsRNAs and virus-like particles. Seven out of nine isolates contained one or more high-molecular-weight dsRNAs and all seven contained isometric virus particles ranging in size from 30 to 50 nm. B. bassiana isolate ICMP#6887 contained a single dsRNA band of ~6 kb and isometric virus-like particles of ~50 nm in diameter. Sequencing revealed that the virus from ICMP#6887 had a genome of 5,327 nt with two overlapping ORFs coding for a putative coat protein (CP) and an RNA-dependent RNA-polymerase (RdRp). The sequence showed a highest CP identity of 58.3 % to Tolypocladium cylindrosporum virus 1 (TcV1) and a highest RdRp identity of 48.8 % to Sphaeropsis sapinea RNA virus 1 (SsRV1). Since both TcV1 and SsRV1 belong to the genus Victorivirus , the new virus from B. bassiana ICMP#6887 was tentatively assigned the name Beauveria bassiana victorivirus 1 (BbVV1-6887).
Archives of Virology – Springer Journals
Published: Jun 1, 2014
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