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Poha, or cape gooseberry (Physalis peruviana L.), is a plant species cultivated in Hawaii for fresh fruit production. In 2015, an outbreak of virus symptoms occurred on poha farms in the South Kohala District of the island of Hawaii. The plants displayed mosaic, stunting, and leaf deformation, and produced poor fruit. Initial testing found the problem associated with Potato virus Y (PVY) infection. Six individual PVY isolates, named Poha1 to Poha6, were collected from field-grown poha plants and subjected to biological and molecular characterization. All six isolates induced mosaic and vein clearing in tobacco, and three of them exhibited O-serotype while the other three reacted only with polyclonal antibodies and had no identifiable serotype. Until now, PVY isolates have been broadly divided into pepper or potato adapted; however, these six PVY isolates from poha were unable to establish systemic infection in pepper and in four tested potato cultivars. Whole-genome sequences for the six isolates were determined, and no evidence of recombination was found in any of them. Phylogenetic analysis placed poha PVY isolates in a distinct, monophyletic “Poha” clade within the PVY C  lineage, suggesting that they represented a novel, biologically and evolutionarily unique group. The genetic diversity within this poha PVY C  clade was unusually high, suggesting a long association of PVY C  with this solanaceous host or a prolonged geographical separation of PVY C  in poha in Hawaii.

phytopathology

Potato virus Y (PVY) Isolates from Physalis peruviana are Unable to Systemically Infect Potato or Pepper and Form a Distinct New Lineage Within the PVYC Strain Group