Inhalt

Evolution; the past, a window on the future?-Systematic search for recombination events in plant viruses and viroids- Different mechanisms of homologous and nonhomologous recombination in brome mosaic virus-Studies on RNA recombination in vivo and in vitro-RNA recombination in viral protein mediated virus resistant transgenic plants-Transgenic plants expressing viral sequences create a favourable environment for recombination between viral sequences-Behaviour of cucumovirus pseudorecombinant and recombinant strains in solanaceous hosts-Recombination between cauliflower mosaic virus and transgenic plants that contain CaMV transgenes: influence of selection pressure on isolation of recombinants-Synergy of virus accumulation and pathogenicity in transgenic plants expressing viral sequences-Risk assessment of transgenic plants expressing the coat protein gene of plum pox potyvirus-Mixed infections and genetic exchange occur in natural populations of cucumber mosaic cucumovirus-The potential of a beneficial satellite RNA of cucumber mosaic virus to acquire deleterious functions: nature versus greenhouses-Ecological impact of transgenic virus-resistance in crop, weed, and wild plant populations (due to potential alterations of plant invasiveness)-Risk assessment of gene flow associated with virus resistant transgenic crop plants-Concluding remarks and recommendations