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• W2034476278 endingPage "46" @default.
• W2034476278 startingPage "23" @default.
• W2034476278 abstract "Begomoviruses (Family Geminiviridae, Genus Begomovirus) have become the most destructive group of plant viruses in tropical and subtropical regions of the world. The recent emergence of begomoviruses is notable, as these viruses have been co-evolving with their dicotyledonous plant hosts for millennia. Agricultural intensification has been proposed as one of the main causes, together with increases in populations of their vector Bemisia tabaci, partly due to the worldwide spread of the more fecund B-biotype. Reports of new diseases and associated epidemics are frequent. Many such reports describe the evolution of more aggressive virus variants through recombination. Little is known about the selection pressures that seem to operate and drive begomovirus evolution towards increased virulence and an extended host range. It is apparent, however, that the genomes of begomoviruses show extreme plasticity leading to an ability to evolve very rapidly in response to changing cropping systems. Genetic diversity is created not only by recombination between genomic components, but also by exchange (pseudorecombination) of their genomic components, and even by acquiring DNA sequences from viruses of other genera. Recently, associations with some satellite molecules, termed DNA-β and DNA1, have also been shown to be widespread in the Old World. Functional DNA-β molecules encode pathogenicity determinants and are often critical for disease symptom development. They appear to act by suppressing host plant defense mechanism(s), such as post-transcriptional gene silencing (PTGS), enabling a diverse range of begomoviruses to infect particular hosts. In this review, suppression of PTGS is one of the driving forces discussed as a likely and important influence on the evolution of begomoviruses. The known sources of genetic variation in begomoviruses are also considered together with the factors driving evolutionary change, the potential for limiting the extent and rate of adverse change, and therefore the potential for achieving more sustainable control of crop disease epidemics." @default.
• W2034476278 created "2016-06-24" @default.
• W2034476278 creator A5018910597 @default.
• W2034476278 creator A5033140981 @default.
• W2034476278 creator A5067082885 @default.
• W2034476278 date "2006-01-01" @default.
• W2034476278 modified "2023-10-14" @default.
• W2034476278 title "Factors Influencing Begomovirus Evolution and Their Increasing Global Significance: Implications for Sustainable Control" @default.
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