Synonymous site variation due to recombination explains higher genetic variability in begomovirus populations infecting non-cultivated hosts
| Autor: | Siobain Duffy, Carolina S. Rocha, F. Murilo Zerbini, Sarah Jacqueline Cavalcanti da Silva, Fabio Nascimento da Silva, Alison T. M. Lima, César A. D. Xavier, Roberto Ramos Sobrinho, Jorge González-Aguilera |
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| Rok vydání: | 2012 |
| Předmět: |
Molecular Sequence Data
Population genetics Whitefly Molecular evolution Virology Plant virus Cluster Analysis Genetic variability Phylogeny Plant Diseases Recombination Genetic biology fungi Begomovirus food and beverages Genetic Variation Sequence Analysis DNA Plants biology.organism_classification Synonymous site variation Recombination Vector (epidemiology) DNA Viral Brazil |
| Zdroj: | LOCUS Repositório Institucional da UFV Universidade Federal de Viçosa (UFV) instacron:UFV |
| ISSN: | 1465-2099 |
| Popis: | 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-infectingMacroptilium yellow spot virus(MaYSV) or the crop-infectingTomato 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. |
| Databáze: | OpenAIRE |
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