Banding patterns of inter-retrotransposon amplified polymorphism (IRAP). Genomic DNAs were separately extracted from individuals of P. westermani (diploids from Haenam, Hn and Nanchang, Nc; triploids from Bogil-do, Bg and Youngam, Ya). The DNAs were used in PCR with the PwRn1 LTR-specific primers, as shown at the bottom. The amplified fragments were electrophoresed on agarose gels and visualized by ethidium bromide staining. White circles indicate triploid genome-specific IRAP markers, which were shared with the Korean diploids. M, lambda DNA/Eco R I + Hin d III marker.