Marker-free site-specific integration plants.

Recently, site-specific recombination methods in plants have been developed to delete selection markers to produce marker-free transgenic plants or to integrate the transgene into a pre-determined genomic location to produce site-specific transgenic plants. However, these methods have been developed independently, and although the strategies of producing marker-free site-specific integration plants have been discussed, the concept has not been demonstrated. In the present study, we combined two approaches to site-specific recombination and demonstrated the concepts for removing the marker after site-specific integration for producing marker-free site-specific transgenic plants.