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Role of recombination in the evolution of natural populations of Cucumber mosaic virus, a tripartite RNA plant virus
Authors:Bonnet Julien  Fraile Aurora  Sacristán Soledad  Malpica José M  García-Arenal Fernando
Affiliation:Departamento de Biotecnología, E.T.S.I. Agrónomos, Universidad Politécnica de Madrid, 28040 Madrid, Spain.
Abstract:The role of recombination in the evolution of Cucumber mosaic virus (CMV) was analyzed in a collection of Spanish isolates from 1989 to 2002. Isolates were characterized by ribonuclease protection assay using six RNA probes, two for each of the three genomic RNAs, which allowed the identification of the analyzed regions as belonging to CMV isolates in subgroups IA, IB, and II. Most isolates belonged to subgroups IA (64%) and IB (12%), 5% were reassortants among subgroups IA, IB, or II, and 17% were recombinants between these groups. Recombinants at RNA3 were significantly more frequent than recombinants at RNAs 1 and 2. One IB-IA recombinant RNA3 was as frequent in central Spain as the IA RNA3. The genetic structure of the virus population suggested that reassortants and most recombinant genotypes were selected against and was consistent with a higher biological cost of reassortment than recombination. Data also suggest that recombinants that encode hybrid proteins are at a higher disadvantage than recombinants that exchange whole ORFs.
Keywords:Cucumber mosaic virus   Virus evolution   Genetic exchange   Reassortment   Recombination   Virus-resistant transgenic plants   Risk assessment
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