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Genetic diversity of the ordinary strain of Potato virus Y (PVY) and origin of recombinant PVY strains. | LitMetric

AI Article Synopsis

Article Abstract

The ordinary strain of Potato virus Y (PVY), PVY(O), causes mild mosaic in tobacco and induces necrosis and severe stunting in potato cultivars carrying the Ny gene. A novel substrain of PVY(O) was recently reported, PVY(O)-O5, which is spreading in the United States and is distinguished from other PVY(O) isolates serologically (i.e., reacting to the otherwise PVY(N)-specific monoclonal antibody 1F5). To characterize this new PVY(O)-O5 subgroup and address possible reasons for its continued spread, we conducted a molecular study of PVY(O) and PVY(O)-O5 isolates from a North American collection of PVY through whole-genome sequencing and phylogenetic analysis. In all, 44 PVY(O) isolates were sequenced, including 31 from the previously defined PVY(O)-O5 group, and subjected to whole-genome analysis. PVY(O)-O5 isolates formed a separate lineage within the PVY(O) genome cluster in the whole-genome phylogenetic tree and represented a novel evolutionary lineage of PVY from potato. On the other hand, the PVY(O) sequences separated into at least two distinct lineages on the whole-genome phylogenetic tree. To shed light on the origin of the three most common PVY recombinants, a more detailed phylogenetic analysis of a sequence fragment, nucleotides 2,406 to 5,821, that is present in all recombinant and nonrecombinant PVY(O) genomes was conducted. The analysis revealed that PVY(N:O) and PVY(N-Wi) recombinants acquired their PVY(O) segments from two separate PVY(O) lineages, whereas the PVY(NTN) recombinant acquired its PVY(O) segment from the same lineage as PVY(N:O). These data suggest that PVY(N:O) and PVY(N-Wi) recombinants originated from two separate recombination events involving two different PVY(O) parental genomes, whereas the PVY(NTN) recombinants likely originated from the PVY(N:O) genome via additional recombination events.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3251920PMC
http://dx.doi.org/10.1094/PHYTO-10-10-0284DOI Listing

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