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Phylodynamic evidence of the migration of turnip mosaic potyvirus from Europe to Australia and New Zealand

Yasaka, R. and Ohba, K. and Schwinghamer, M. W. and Fletcher, J. and Ochoa-Corona, F. M. and Thomas, J. E. and Ho, S. Y. W. and Gibbs, A. J. and Ohshima, K. (2015) Phylodynamic evidence of the migration of turnip mosaic potyvirus from Europe to Australia and New Zealand. Journal of General Virology, 96 (Pt_3). p. 701. ISSN 0022-1317

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Article Link(s): http://dx.doi.org/10.1099/jgv.0.000007

Publisher URL: http://vir.sgmjournals.org/content/96/Pt_3/701

Abstract

Turnip mosaic virus (TuMV) is a potyvirus that is transmitted by aphids and infects a wide range of plant species. We investigated the evolution of this pathogen by collecting 32 isolates of TuMV, mostly from Brassicaceae plants, in Australia and New Zealand. We performed a variety of sequence-based phylogenetic and population genetic analyses of the complete genomic sequences and of three non-recombinogenic regions of those sequences. The substitution rates, divergence times and phylogeographical patterns of the virus populations were estimated. Six inter- and seven intralineage recombination-type patterns were found in the genomes of the Australian and New Zealand isolates, and all were novel. Only one recombination-type pattern has been found in both countries. The Australian and New Zealand populations were genetically different, and were different from the European and Asian populations. Our Bayesian coalescent analyses, based on a combination of novel and published sequence data from three nonrecombinogenic protein-encoding regions, showed that TuMV probably started to migrate from Europe to Australia and New Zealand more than 80 years ago, and that distinct populations arose as a result of evolutionary drivers such as recombination. The basal-B2 subpopulation in Australia and New Zealand seems to be older than those of the world-B2 and -B3 populations. To our knowledge, our study presents the first population genetic analysis of TuMV in Australia and New Zealand. We have shown that the time of migration of TuMV correlates well with the establishment of agriculture and migration of Europeans to these countries.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Australia and New Zealand DNA sequence Europe evolutionary rate genetic analysis genetic recombination genetic variability nonhuman phylogeny population structure Potyvirus priority journal turnip mosaic virus viral phenomena and functions virus migration Aphididae Brassica rapa subsp. rapa Brassicaceae
Subjects:Plant culture > Food crops
Science > Botany > Genetics
Plant pests and diseases
Science > Entomology
Deposited On:18 Mar 2015 03:46
Last Modified:18 Mar 2015 03:46

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