Vessela Mavrodieva, United States Department of Agriculture (USDA), Animal and Plant Health Inspection Services (APHIS), Plant Protection and Quarantine (PPQ), Center for Plant Health Science and Technology (CPHST) Beltsville Laboratory, Bldg. 580, BARC-East, Powder Mill Rd., Beltsville, MD 20705, USA;
Delano James, Sidney Laboratory, Canadian Food Inspection Agency (CFIA), 8801 East Saanich Road, Sidney, BC, V8L 1H3, Canada;
Karen Williams and
Sarika Negi, USDA APHIS PPQ CPHST Beltsville Laboratory, Bldg. 580, BARC-East, Powder Mill Rd., Beltsville, MD 20705, USA;
Aniko Varga, Sidney Laboratory, CFIA, 8801 East Saanich Road, Sidney, BC, V8L 1H3, Canada;
Ray Mock, USDA, Agricultural Research Service, National Germplasm Resources Laboratory, 10300 Baltimore Ave., Beltsville, MD, USA; and
Laurene Levy, USDA APHIS PPQ CPHST Beltsville Laboratory, Bldg. 580, BARC-East, Powder Mill Rd., Beltsville, MD 20705, USA
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Accepted for publication 11 July 2012.
Four of 19 Prunus germplasm accessions hand carried from the Ukraine into the United States without authorization were found to be infected with Plum pox virus (PPV). Of the three isolates characterized, isolates UKR 44189 and UKR 44191 were confirmed to be isolates of PPV strain W, and UKR 44188 was confirmed to be an isolate of PPV strain D. UKR 44189 and UKR 44191 are very closely related to the PPV strain W isolate LV-145bt (HQ670748) from Latvia. Nucleotide and amino acid sequence identities between these three isolates were greater than 99%. This indicates that the isolates are very closely related and likely originated from a common source. The high genetic diversity among PPV-W strain isolates allowed the identification of potential recombination events between PPV isolates. It appears also that GF 305 peach and Prunus tomentosa are not hosts for the PPV isolate UKR 44189.
This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 2013.