Abstract:

62 polymorphic SSR primers were used to study the genetic relationships of 59 cucumber materials. Germplasm used in this study were divided into 7 groups by cluster analysis. Six European greenhouse ecotype materials with no spines were in the 1st group. Four American ecotype germplasm with small fruits belonged to the 2nd group. The Xishuangbanna cucumber D59 formed the 3th group. The genetic distance between D59 and other materials were more than 0.33. The white fruited accession D38 belonged to 4th group. The accession D13 and its male parent D39 which were the progenies of European greenhouse ecotype and North China ecotype were in the 5th group. The leaf color mutant D28 was the only accession in the 6th group. The 7th group were consisted of 33 north China type materials, 7 south China type accessions and 4 Japanese type germplasm. Results obtained from the principal coordinate analysis were consistent with those from the cluster analysis, which were in according with the morphological taxonomy on cucumber.

Key words: cucumber, genetic diversity, SSR, cluster analysis, PCA