Abstract
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.
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Acknowledgments
This research was funded in part by the National Natural Science Foundation (No. 30670199, 30770185, and 30870180), the Natural Science Foundation of Zhejiang Province (No. X305692 and No. X301406), the Zhijiang Scientific and Technological Program (2006C32016), the Hangzhou Scientific and Technological Program (2005132H06), and Qianjiang Scholar Program. The authors are grateful to Mr. Stephen G. Glover at CFS-NRCan for the critical review on the manuscript.
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Wang, HZ., Wu, ZX., Lu, JJ. et al. Molecular diversity and relationships among Cymbidium goeringii cultivars based on inter-simple sequence repeat (ISSR) markers. Genetica 136, 391–399 (2009). https://doi.org/10.1007/s10709-008-9340-0
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DOI: https://doi.org/10.1007/s10709-008-9340-0