Molecular diversity and relationships among Cymbidium goeringii cultivars based on inter-simple sequence repeat (ISSR) markers.
Spring orchid (Cymbidium goeringii) is a popular flowering plant species. There have been few molecular studies of the genetic diversity and conservation genetics on this species. An assessment of the level of genetic diversity in cultivated spring orchid would facilitate development of the future germplasm conservation for cultivar improvement. In the present study, DNA markers of intersimple sequence repeats (ISSR) were identified and the ISSR fingerprinting technique was used to evaluate genetic diversity in C. goeringii cultivars. Twenty-five ISSR primers were selected to produce a total of 224 ISSR loci for evaluation of the genetic diversity. A wide genetic variation was found in the 50 tested cultivars with Nei's gene diversity (H = 0.2241) and 93.75% of polymorphic loci. Fifty cultivars were unequivocally distinguished based on ISSR fingerprinting. Cultivar-specific ISSR markers were identified in seven of 50 tested cultivars. Unweighted pair-group mean analysis (UPGMA) and principal coordinates analysis (PCA) grouped them into two clusters: one composed the cultivars mainly from Japan, and the other contained three major subclusters mainly from China. Two Chinese subclusters were generally consistent with horticultural classification, and the third Chinese subcluster contained cultivars from various horticultural groups. Our results suggest that the ISSR technique provides a powerful tool for cultivar identification and establishment of genetic relationships of cultivars in C. goeringii.
Wang
Hui-Zhong
HZ
Key Laboratory of Biochemistry and Molecular Biology, Hangzhou Normal University, Hangzhou, China. whz62@163.com
Wu
Zhen-Xing
ZX
Lu
Jiang-Jie
JJ
Shi
Nong-Nong
NN
Zhao
Yan
Y
Zhang
Zhi-Tao
ZT
Liu
Jun-Jun
JJ
D016000:Cluster Analysis; D003247:Conservation of Natural Resources; D005819:Genetic Markers / Q000235:genetics; D014644:Genetic Variation; D018598:Minisatellite Repeats / Q000235:genetics*; D029595:Orchidaceae / Q000145:classification* / Q000235:genetics*; D011110:Polymorphism, Genetic; D012621:Seasons; D013045:Species Specificity
D005819:Genetic Markers