| Autor: |
Tomimura, K., Gibbs, A. J., Jenner, C. E., Walsh, J. A., Ohshima, K. |
| Předmět: |
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| Zdroj: |
Molecular Ecology; Aug2003, Vol. 12 Issue 8, p2099-2111, 13p |
| Abstrakt: |
Abstract The genomes of a representative world-wide collection of 32 Turnip mosaic virus (TuMV) isolates were sequenced and these, together with six previously reported sequences, were analysed. At least one-fifth of the sequences were recombinant. In phylogenetic analyses, using genomic sequences of Japanese yam mosaic virus as an outgroup, the TuMV sequences that did not show clear recombination formed a monophyletic group with four well-supported lineages. These groupings correlated with differences in pathogenicity and provenance; the sister group to all others was of Eurasian B-strain isolates from nonbrassicas, and probably represents the ancestral TuMV population, and the most recently ‘emerged’ branch of the population was probably that of the BR-strain isolates found only in east Asia. Eight isolates, all from east Asia, were clear recombinants, probably the progeny of recent recombination events, whereas a similar number, from other parts of the world, were seemingly older recombinants. This difference indicates that the presence of clear recombinants in a subpopulation may be a molecular signature of a recent ‘emergence’. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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