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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 263 (2000), S. 22-29 
    ISSN: 1617-4623
    Keywords: Key words Direct repeat ; Recombination ; Transposon ; Arabidopsis ; β-Glucuronidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In plants, the frequency of spontaneous intrachromosomal homologous recombination is low. Here, we show that a maize transposable element greatly stimulates intrachromosomal homologous recombination between direct repeat sequences in Arabidopsis. Plants were transformed with a construct (GU-Ds-US) containing a Ds (Dissociation) transposable element inserted between two partially deleted GUS reporter gene segments. Homologous recombination between the overlapping GUS fragments generates clonal sectors visible upon staining for GUS activity. Plants containing the GU-Ds-US construct and a source of Ac (Activator) transposase showed an over 1000-fold increase in the incidence of recombination relative to plants containing the same construct but lacking transposase. Transposon-induced recombination was observed in vegetative and floral organs, and several germinally transmitted events were recovered. Transposon-induced recombination appears to be a general phenomenon in plants, and thus may have contributed to genome evolution by inducing deletions between repeated sequences.
    Type of Medium: Electronic Resource
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