PROBLEM TO BE SOLVED: To provide a technique that efficiently prepares a recombinant plant body such as a homologous recombinant.SOLUTION: A recombinant vector used for a plant body includes a region for expressing a selection marker which affirms a recombinant, and also includes a site-specific recombination system for removing the selection marker under control of a differentiation-inducing promoter which activates by tissue differentiation induction.