1887

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Volume 94, Issue 2

Synonymous site variation due to recombination explains higher genetic variability in begomovirus populations infecting non-cultivated hosts Free

Abstract

Begomoviruses are ssDNA plant viruses that cause serious epidemics in economically important crops worldwide. Non-cultivated plants also harbour many begomoviruses, and it is believed that these hosts may act as reservoirs and as mixing vessels where recombination may occur. Begomoviruses are notoriously recombination-prone, and also display nucleotide substitution rates equivalent to those of RNA viruses. In Brazil, several indigenous begomoviruses have been described infecting tomatoes following the introduction of a novel biotype of the whitefly vector in the mid-1990s. More recently, a number of viruses from non-cultivated hosts have also been described. Previous work has suggested that viruses infecting non-cultivated hosts have a higher degree of genetic variability compared with crop-infecting viruses. We intensively sampled cultivated and non-cultivated plants in similarly sized geographical areas known to harbour either the weed-infecting (MaYSV) or the crop-infecting (ToSRV), and compared the molecular evolution and population genetics of these two distantly related begomoviruses. The results reinforce the assertion that infection of non-cultivated plant species leads to higher levels of standing genetic variability, and indicate that recombination, not adaptive selection, explains the higher begomovirus variability in non-cultivated hosts.

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© 2013 SGM
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2013-02-01
2024-04-18
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Synonymous site variation due to recombination explains higher genetic variability in begomovirus populations infecting non-cultivated hosts
J. Gen. Virol. 94, 418 (2013); https://doi.org/10.1099/vir.0.047241-0
/content/journal/jgv/10.1099/vir.0.047241-0
/content/journal/jgv/10.1099/vir.0.047241-0
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