GENETIC DIVERSITY OF FIVE FRESHWATER MUSSELS IN GENUS ANODONTA (MOLLUSCA: BIVALVIA) REVEALED BY RAPD ANALYSIS
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Abstract: Unionidae are an important group of benthic freshwater species.Due to the convergence phenomenon within freshwater mussels, there is still much controversy in the classification of Chinese Unionidae.In China, most studies on freshwater mussels emphasized resource investigation, biology andmorphology, while little has been done in genetics, and particularly not in population genetic structure as well as genetic diversity. In order to further understand the status of genetic diversity of different species, random amplified polymorphic DNA (R APD )markers were used to detect genetic diversity of populations in five species of the genus Anodonta :Anodonta arcaeformis, A.arcaeformis flavotincta, A.fluminea, A.woodiana woodiana and A.w. pacifica. DNA extraction methodwasbased on phenol-chloroform and extractedgenomic DNA from the adductor muscle andmantle tissues. Sixteen random primers were used for RAPD amplification and the polymorphism of amplified loci were analyzed.The results demonstrated that the percentage of amplified polymorphic loci for various populations ranged from 34. 5% to 62. 8%, the mean Shannon' s genetic diversity indices ranged from 0. 2021 to 0. 3552, and the mean intra -population Nei' s genetic distance ranged from 0. 1386 to 0. 1713. In all populationsof the five species, the genetic diversity for A.arcaeformis wasthe largest, andthat of A.fluminea was the lowest. The inter -population genetic distance between A.w.woodiana and A.w.pacifica was 0. 3186, so they can be considered as two sister species at the genetic angle.
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Keywords:
- Genus Anodonta
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