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Abstract

Tian, Y. P., Liu, J. L., Zhang, C. L., Liu, Y. Y., Wang, B., Li, X.-D., Guo, Z. K., and Valkonen, J. P. T. 2011. Genetic diversity of Potato virus Y infecting tobacco crops in China. Phytopathology 101:377-387.Genetic variability of Potato virus Y (PVY) isolates infecting potato has been characterized but little is known about genetic diversity of PVY isolates infecting tobacco crops. In this study, PVY isolates were collected from major tobacco-growing areas in China and single-lesion isolates were produced by serial inoculation on Chenopodium amaranticolor. Most isolates (88%) caused systemic veinal necrosis symptoms in tobacco. Of these, 16 isolates contained a PVY(O)-like coat protein (CP) and PVY(N)-like helper component proteinase (HC-pro) and, in this respect, were similar to the PVY(N-wi), PVY(N:O), and PVY-HN2 isolates characterized from potato in Europe, the United States, and China, respectively; two isolates contained a PVV(O)-like HC-pro and a PVY(N)-like CP; another two isolates had recombination junctions in the CP-encoding region. Both the HC-pro and CP of PVY were under negative selection as a whole; however, seven amino acids in HC-pro and six amino acids in CP were under positive selection. Selection pressures differed between the subpopulations of PVY distinguished by phylogenetic analysis of HC-pro and CP sequences. When PVY isolates from potato were included, no host-specific clustering of the PVY isolates was observed in phylogenetic and nucleotide diversity analyses, suggesting frequent spread of PVY isolates between potato and tobacco crops in the field.

Published in

Phytopathology
2011, volume: 101, number: 3, pages: 377-387
Publisher: AMER PHYTOPATHOLOGICAL SOC

SLU Authors

Global goals (SDG)

SDG2 Zero hunger

UKÄ Subject classification

Agricultural Science

Publication identifier

  • DOI: https://doi.org/10.1094/PHYTO-02-10-0055

Permanent link to this page (URI)

https://res.slu.se/id/publ/59247