ArticleVirology journal2025
Bayesian phylogenetic and recombination analyses of plum pox virus provide a refined vision of its evolutionary history.
Article in Virology journal, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe discovery of a plum tree isolate of plum pox virus (PPV, Potyvirus plumpoxi), done in Eastern Albania in 2011 in the frame of an EU-funded survey, which represents a divergent strain named PPV-An, proved to be original and informative for the unraveling of PPV evolutionary history.
methodsMaximum likelihood and Bayesian phylogenetic methods applied on full-length genomes or selected regions analyzed the affinities of the PPV-An with other PPV strains. Potential recombination events were also evaluated. A refined timeline of PPV evolutionary history integrating recombination events, strains migration and ancestral host state is proposed.
resultsAltogether, the analyses confirm previous hypotheses that PPV-An corresponds to an ancestral, non-recombinant PPV strain. PPV-An likely served as the origin of the PPV-M and T strains through recombination with isolate(s) of the D strain. Molecular clock analyses dated the most recent common ancestor (TMRCA) of PPV at 4546 years ago and phylogeny separated the main PPV strains from the cherry-adapted strains around 3100 years ago. Meanwhile, the recombination events that gave rise to the M and T strains are estimated to have occurred in the early sixteenth century of the common era (CE).
conclusionsThe characterization of the PPV-An strain enabled a comprehensive phylogenetic analysis of PPV. PPV-An is confirmed to be the previously unidentified progenitor, which, together with PPV-D led through recombination to the emergence of the currently prevalent and evolutionary successful recombinant strains of European origin (e.g., M, Rec, and T). The low representation of PPV-An in current PPV populations is likely the consequence of a population replacement phenomenon possibly linked to a higher fitness of the recombinant strains deriving from it. These results highlight the PPV-An strain as a key player in PPV evolutionary history and consolidate PPV as one of the promising models to study host-adaptive evolution processes and phylogeography among the most damaging viruses of agricultural systems.
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