Genetic Relationships among Wild Dendrobium officinale Populations in Taining, Fujian by ISSR

Abstract:

In order to understand the genetic relationships among germplasms of Dendroubium officinale, the genetic relationships and genetic diversity of 34 germplasms of D. officinale were analyzed by ISSR. The results showed that total 78 bands were amplified by 9 ISSR primers with percentage of polymorphic loci at 100%. UPGMA cluster analysis indicated that the similarity coefficient ranged from 0.61 to 0.92, and wild and cultivated D. officinale were divided into 2 groups at level of 0.626. The Nei's gene diversity (H) and coefficient of gene differentiation (G_st) of wild D. officinale from Fujian Taining was 0.3111 and 0.4609, respectively, which were higher than those of cultivated D. officinale (0.3056 and 0.4204, respectively), indicated that there were high diversity and gene differentiation among Taining D. officianle populations. AMOVA analysis showed that variation coefficients between populations and within populations were 24% and 76%, respectively, which indicated that there was gene flow among different populations. These would provide theoretical basis and reference for efficient protect and utilization of wild D. officinale germplasms.

Key words:Dendrobium officinale;Genetic relationship;ISSR;Genetic diversity