Fig. 1. The distributions of 62 SSR alleles (A) and 18 alleles undetected in the oat cultivars released since 1990 (B) with respect to their occurrence frequencies in all 96 oat cultivars. Fig. 1A also separately illustrates four and 16 SSR alleles of occurrence frequency less than or equal to 0.02 and 0.05, respectively. Note that different scales are presented in the axes of Fig. 1A-B.