The genetic diversity was detected using RAPD markers in 21 oat genotypes from 8 oat species, and the cluster analysis was undertaken. Using 22 polymorphic 10-mer arbitrary primers against 21 genotypes, a total of 114 fragments were amplified ,among which 97(85.1%) products were found to be polymorphic. These products were used to calculate genetic distance(GD),and it was indicated that the genetic distances between different species were generally larger than those within every species. The result of clust...