Abstract
Partial nucleotide sequences of five tomato infecting Begomovirus isolates were determined from DNA-A fragments, corresponding to the 5' region of the replication associated protein gene, the intergenic region and the 5' region of the coat protein gene. Isolate DFM shared 95% identity with Tomato mottle leaf curl virus (TMoLCV), isolates 34, PA-05, and Ta4 were 88% identical to Tomato yellow vein streak virus and isolate DF-BR3 shared 77% identity with TMoLCV. Recombination analysis indicated that isolate DF-BR3 was a chimaera, and it provided evidence that there is a complex and actively recombining population of tomato infecting begomoviruses in Brazil.
Highlights
Resumo – A seqüência de nucleotídeos parcial de cinco isolados de Begomovirus foi determinada do DNA-A, correspendente à região intergênica e à porção 5' do gene associado à replicação e da capa protéica
Tomato golden mosaic virus (TGMV) was the only Brazilian tomato infecting species described prior to the 1990’s (Flores et al, 1960), other less characterized species with the potential to infect tomato might have been present in the country since before the 1970’s (Costa, 1974)
Since the introduction into Brazil of a new whitefly vector biotype (Bemisia tabaci Genn. biotype B or B. argentifolii Bellows & Perring) in the 1990’s, ensuing geminivirus epidemics in tomatoes, which resulted in the identification of ten other tomato infecting Brazilian begomovirus species/provisional species (Ribeiro et al, 2003)
Summary
Resumo – A seqüência de nucleotídeos parcial de cinco isolados de Begomovirus foi determinada do DNA-A, correspendente à região intergênica e à porção 5' do gene associado à replicação e da capa protéica. Given the diverse assemblage of tomato infecting Brazilian begomoviruses and potentially high incidences of coinfection, there is a chance that recombination between different tomato infecting begomovirus species might currently be This report describes the genetic diversity of, and recombination between, tomato begomoviruses sampled in the Brasília region of Brazil, in 2001.
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