XVI International Botanical Congess

The genetic relationships among 67 peach cultivars were investigated using RAMP markers. Eighty-eight polymorphic bands were obtained from ten combinations of primers. The cluster analysis and principal coordinate analysis based on RAMP data revealed that the groupings were consistent with the origins of cultivars. The genetic diversity among and within common peach, nectarine, and Peen-to peach groups were 9.70% and 90.30% of the total variation respectively based on Shannon's diversity index. Analysis of molecular variance (AMOVA) revealed that the variance components attributable to the differences among and within groups were 28.83% and 71.17% of the total variance respectively. RAPD markers were also obtained using the same experimental conditions as RAMP. The result indicated that RAMP was more useful than RAPD for studing the genetic relationships among peach cultivars.