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Double stranded RNAs from  Prunus  samples gathered from various surveys were analyzed by a deep-sequencing approach. Contig annotations revealed the presence of a potential new viral species in an Azerbaijani almond tree ( Prunus amygdalus ) and its genome sequence was completed. Its genomic organization is similar to that of the recently described  Apricot vein clearing associated virus  (AVCaV) for which two new isolates were also characterized, in a similar fashion, from two Japanese plums ( Prunus salicina ) from a French germplasm collection. The amino acid identity values between the four proteins encoded by the genome of the new virus have identity levels with those of AVCaV which fall clearly outside the species demarcation criteria. The new virus should therefore be considered as a new species for which the name of Caucasus prunus virus (CPrV) has been proposed. Phylogenetic relationships and nucleotide comparisons suggested that together with AVCaV, CPrV could define a new genus (proposed name: Prunevirus) in the family  Betaflexiviridae . A molecular test targeting both members of the new genus was developed, allowing the detection of additional AVCaV isolates, and therefore extending the known geographical distribution and the host range of AVCaV. Moreover, the phylogenetic trees reconstructed with the amino acid sequences of replicase, movement and coat proteins of representative  Betaflexiviridae  members suggest that  Citrus leaf blotch virus  (CLBV, type member of the genus  Citrivirus ) may have evolved from a recombination event involving a Prunevirus, further highlighting the importance of recombination as a driving force in  Betaflexiviridae  evolution. The sequences reported in the present manuscript have been deposited in the GenBank database under accession numbers KM507061-KM504070.

plos one

Characterization of New Isolates of Apricot vein clearing-associated virus and of a New Prunus-Infecting Virus: Evidence for Recombination as a Driving Force in Betaflexiviridae Evolution