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Abstract SRAP markers were employed to analyze the genetic diversity of potato varieties. The results showed that 23 out of the random selected 27 primer pairs were polymorphic among the 44 varieties tested, 104 polymorphism bands were obtained, and the polymorphism ratio of primers was 85.2%; the average polymorphism bands was 4.5 per primer pair. These results demonstrated that SRAP had higher polymorphism in the tested potato varieties. Based on cluster analysis with the SRAP makers, the genetic distance range among the tested 44 varieties was from 0.147 to 0.741. At the genetic distance（D）of 0.67, 44 varieties were clustered into 4 main groups, including one compound group and three discrete ones. The compound group could be subdivided into 7 subgroups. The great genetic diversity of the tested potato varieties was thus confirmed at the DNA level.
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Received: 20 April 2007
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