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Tamarillo, or tree tomato (Solanum betaceum), is a perennial small tree or shrub species cultivated in subtropical areas for fresh fruit and juice production. In Ecuador, tamarillo orchards are affected by several viruses, with one previously identified as potato virus Y (PVY); however, the specific strain composition of PVY in tamarillo was not determined. In 2015 and 2016, eight tamarillo plants exhibiting symptoms of leaf drop, mosaic, and mottled fruit were sampled near Tumbaco and Quito, Ecuador. These tamarillo PVY isolates were able to systemically infect tobacco, Nicotiana benthamiana, naranjilla, and tamarillo. Seven of the eight PVY isolates from tamarillo exhibited N-serotype, while one of the PVY isolates studied, Tam15, had no identifiable serotype. One isolate, Tam17, had N-serotype but produced asymptomatic systemic infection in tobacco. In tamarillo, four tamarillo isolates induced mosaic and slight growth retardation and were unable to systemically infect pepper or potato. Tamarillo, on the other hand, was unable to support systemic infection of PVY isolates belonging to the PVY O  and PVY Eu-N  strains. The whole genomes of eight PVY isolates were sequenced from a series of overlapping RT-PCR fragments. Phylogenetically, tamarillo PVY isolates were found to belong to the large PVY N  lineage, in a new tamarillo clade. Recombination analysis revealed that these tamarillo PVY isolates represent at least three novel recombinant types not reported before. The combination of the biological and molecular properties found in these eight PVY isolates suggested the existence of a new tamarillo strain of PVY that may have coevolved with S. betaceum.

phytopathology

Potato Virus Y (PVY) Isolates from <i>Solanum betaceum</i> Represent Three Novel Recombinants Within the PVY<sup>N</sup> Strain Group and Are Unable to Systemically Spread in Potato

Potato Virus Y (PVY) Isolates from Solanum betaceum Represent Three Novel Recombinants Within the PVYN Strain Group and Are Unable to Systemically Spread in Potato

Potato Virus Y (PVY) Isolates from Solanum betaceum Represent Three Novel Recombinants Within the PVY^N Strain Group and Are Unable to Systemically Spread in Potato