The W8 isolate of the phytopathogenic fungus, Rosellinia necatrix that causes white root rot, contained three segments of double-stranded (ds) RNA, namely L1, L2 and M. Purified viral particles of about 25 nm in diameter contained an RNA segment with almost the same mobility as M-dsRNA, but the band was sensitive to S1 nuclease. Molecular analysis revealed that M-dsRNA consisted of two (RNA 1 and RNA 2) similarly sized species of 2299 and 2279 bp excluding an interrupted poly (A or U) tail of 16–51 bp. The predicted largest open reading frame in RNA 1 and RNA 2 was similar to those of RNA dependent RNA polymerase (RdRp) and coat protein (CP), respectively, encoded by the family Partitiviridae . The non-coding regions (NCR) of the two segments were similar (approximately 70% base identity) at the 5′ end, but different at the 3′ end. The NCR at the 3′ end contained adenosine-uracil rich elements (AREs) in both segments. Northern analyses revealed RNA 1 and RNA 2 in mycelial and viral particle fractions. We coined the name Rosellinia necatrix partitivirus 1-W8 (RnPV1-W8) for M-dsRNA based on viral particle morphology and sequence information.
Archives of Virology – Springer Journals
Published: Jun 1, 2005
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