Agrobacterium tumefaciens
Although only a few studies have been reported on natural genetic transformation in the "Alphaproteobacteria", this process has been described in "Agrobacterium tumefaciens", "Methylobacterium organophilum", and "Bradyrhizobium japonicum". Natural genetic transformation is a sexual process involving DNA transfer from one bacterial cell to another through the intervening medium, and the integration of the donor sequence into the recipient genome by homologous recombination.