Genetic Diversity of Nine Non-Recombinant Potato virus Y Isolates From Three Biological Strain Groups: Historical and Geographical Insights

Plant Disease
Kelsie J GreenAlexander V Karasev

Abstract

Potato virus Y (PVY) isolates from potato currently exist as a complex of six biologically defined strain groups all containing nonrecombinant isolates and at least 14 recombinant minor phylogroups. Recent studies on eight historical UK potato PVY isolates preserved since 1984 found only nonrecombinants. Here, four of five PVY isolates from cultivated potato or wild Solanum spp. collected recently in Australia, Mexico, and the U.S.A. were typed by inoculation to tobacco plants and/or serological testing using monoclonal antibodies. Next, these five modern isolates and four additional historical UK isolates belonging to biological strain groups PVYC, PVYZ, or PVYN obtained from cultivated potato in 1943 to 1984 were sequenced. None of the nine complete PVY genomes obtained were recombinants. Phylogenetic analysis revealed that the four historical UK isolates were in minor phylogroups PVYC1 (YC-R), PVYO-O (YZ-CM1), PVYNA-N (YN-M), or PVYEu-N (YN-RM), Australian isolate YO-BL2 was in minor phylogroup PVYO-O5, and both Mexican isolate YN-Mex43 and U.S.A. isolates YN-MT12_Oth288, YN-MT12_Oth295, and YN-WWAA150131G42 were in minor phylogroup PVYEu-N. When combined, these new findings and those from the eight historical UK isolates se...Continue Reading

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