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Tipo: Artigo
Título: Synonymous site variation due to recombination explains higher genetic variability in begomovirus populations infecting non-cultivated hosts
Autor(es): Lima, Alison T. M.
Sobrinho, Roberto R.
González-Aguilera, Jorge
Rocha, Carolina S.
Silva, Sarah J. C.
Xavier, César A. D.
Silva, Fábio N.
Zerbini, F. Murilo
Duffy, Siobain
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 Macroptilium yellow spot virus (MaYSV) or the crop-infecting Tomato severe rugose virus (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.
Palavras-chave: Synonymous site variation
Genetic variability
Editor: Journal of General Virology
Tipo de Acesso: Open Access
Data do documento: 1-Fev-2013
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