Plant annular artificial chromosomes

The present invention is full-length or partial centromeric regions from plant chromosomes, and to a plant containing a plant annular artificial chromosomes containing the recognition site of at least one site-specific recombinase. Further the plant includes the steps of preparing a plant A containing chromosomes are introduced in the forward direction at a position sandwiching the entire length or part of the recognition site centromeric region of (a) 2 two site-specific recombinase ; and (b) can be prepared by the process of crossing the plant a, and a plant B containing a gene encoding a site-specific recombinase.