Abstract
The potato virus Y (PVY) complex includes five non-recombinant strains and a growing number of recombinants. Up to now, the bulk of these PVY recombinants were found to be composed of genome segments coming from only two “parental” genomes, PVYO and PVYEu-N, with a small minority including segments from other parents, e.g. PVYC, PVYNA-N, and a segment of the recombinant strain PVY-NE11. Here, comprehensive analyses of 396 whole genomes of PVY isolates from 34 countries and a variety of hosts revealed 28 isolates to be rare or novel recombinants. When subjected to a thorough recombination analysis, these 28 PVY isolates were found to represent 25 poorly sampled PVY recombinant structures, ten of which had not been recognized previously. Nine of the ten novel structures carried parental sequences from PVYNA-N or PVY-NE11 strains recombined with PVYO and PVYEu-N sequences, while seven of the new structures contained sequences from three different parents. The number of known PVY recombinant patterns now stands at thirty six. These recombinant structures present a challenge for PVY strain typing, but may shed light on interactions between PVY and host resistance genes.
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This work was funded in part through grants from the United States Department of Agriculture (USDA)-NIFA-NRI (2009-35600-05025), USDA-NIFA-SCRI (2009-51181-05894 and 2014-51181-22373), USDA-ARS (58-5354-7-540, 58-5354-2-345, and 58-1907-8-870), Northwest Potato Research Consortium, Idaho Potato Commission, by the USDA-NIFA-Hatch project IDA01560 and by the Idaho Agricultural Experiment Station.
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Green, K.J., Brown, C.J. & Karasev, A.V. Genetic diversity of potato virus Y (PVY): sequence analyses reveal ten novel PVY recombinant structures. Arch Virol 163, 23–32 (2018). https://doi.org/10.1007/s00705-017-3568-x
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DOI: https://doi.org/10.1007/s00705-017-3568-x