title: Genetic structure of a population of Potato virus Y inducing potato tuber necrotic ringspot disease in Japan; comparison with North American and European populations.
abstract: The structure of Potato virus Y (PVY) populations causing potato tuber necrotic ringspot disease (PTNRD) was analysed. The full-length sequences of the genomic RNAs of five geographically distinct isolates from Japan were determined. Recombination and phylogenetic analyses of European, North American and Japanese isolates of PVY showed that the world PVY population has three major lineages and two sublineages. Most recombinants were interlineage, and one isolate from Europe was identified as an intralineage recombinant. No recombinants were found among Japanese PTNRD isolates, which were most closely related to PTNRD isolates previously found in North America. Comparison of the within- and between population nucleotide diversities in the N lineage sequences from Japan, Europe and North America showed that Japanese population was distinct from the European and North American populations. The nucleotide sequences of the protein 1 and coat protein genes of a further 18 isolates were determined. One Japanese clade had radiated in a star burst as shown by its deviation from the neutral equilibrium model and its small nucleotide diversity. Our results suggest that PVY PTNRD was recently introduced into Japan more than once, and has expanded throughout Japan from founder populations.
authors.affiliation: Aino Potato Branch, Nagasaki Agriculture and Forestry Experiment Station, Nagasaki 854-0302, Japan.
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Ogawa
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tomitaka
authors.forename: Akio
authors.initials: A
authors.lastname: Nakagawa
authors.forename: Kazusato
authors.initials: K
authors.lastname: Ohshima
mesh_terms: D036022:Capsid Proteins / Q000235:genetics; D016000:Cluster Analysis; D016679:Genome, Viral; D007564:Japan; D017720:Molecular Epidemiology; D008969:Molecular Sequence Data; D010802:Phylogeny; D010935:Plant Diseases / Q000821:virology*; D017800:Potyvirus / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D012367:RNA, Viral / Q000235:genetics; D011995:Recombination, Genetic; D017422:Sequence Analysis, DNA; D017385:Sequence Homology; D011198:Solanum tuberosum / Q000821:virology*; D014764:Viral Proteins / Q000235:genetics
chemical_list: D036022:Capsid Proteins; C409826:P1 protein, potyvirus; D012367:RNA, Viral; D014764:Viral Proteins; C090960:coat protein, Potato virus Y