1887

Abstract

The sequence of the 3′-terminal 1768 nucleotides of the PS and ŏo6 isolates of plum pox virus (PPV) has been determined and compared with that of the equivalent regions of other PPV isolates sequenced previously. The sequenced region is part of the PPV open reading frame encoding the last 186 amino acids of the NIb protein and the coat protein (CP, 330 amino acids), followed by a non-coding region of 220 nucleotides and a poly(A) tail. PPV-PS and PPV-ŏo6, just like PPV-El Amar, show rather high levels of nucleotide diversity in the sequence encoding the C-terminal region of the NIb protein (19.4 to 31%) and the N terminus of CP (22.8 to 41.1%) when compared with PPV-Rankovic, PPV-D and PPV-NAT, whereas the level of diversity in the rest of the CP sequence and the 3′ non-coding region is low (8 to 10.8% and 5.5 to 7.7%, respectively). However, the first 429 sequenced nucleotides of PPV-ŏo6 are very similar to those of the PPV-Rankovic, PPV-D and PPV-NAT isolates, whereas the rest of the sequence clearly resembles PPV-PS. Thus, PPV-ŏo6 seems to be the result of a natural recombination event between two wild strains of PPV. To our knowledge this is the first evidence of homologous RNA recombination (a process which could play an important role in the evolution of RNA viruses) within the potyvirus group.

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1993-03-01
2022-08-16
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