PROCESS FOR THE SITE-DIRECTED INTEGRATION OF DNA INTO THE GENOME OF PLANTS

摘要

The present invention provides a method for site-directed integration of DNA-sequences into the genome of plants via homologous recombination, by transforming said plants using the DNA-transfer system of Agrobacterium, in which the transforming DNA comprises in its most simple form a region homologous to the target locus, as well as a region which is different from the target locus either next to one or between two T-DNA borders. Special constructs are provided, which in its most complete form have the general structure (I), in which box (1) and (7) represent T-DNA borders, boxes (2) and (6) comprise functional expression cassettes containing negative selection genes, box (3) provides a region of homology with the target locus promoting recombination, box (4) represents a DNA sequence containing a mutation with respect to the target locus, box (5) represents a functional expression cassette containing a positive selection gene, and box (E) comprises a DNA sequence which is homologous to a region adjacent of the target locus, or in the vicinity of the target locus, which promotes homologous recombination.