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Volume: 2, Issue: 4, July-Aug, 2014
Genetic divergence and gene flow in three populations of Notopterus notopterus (Pallas, 1769), Madhya Pradesh
Garg RK, Batav N and Singh RK
Random amplified polymorphic DNA (RAPD) analysis has been used to elucidate genetic diversity among and within three populations of Notopterus notopterus (Pallas, 1769) of Madhya Pradesh. Genetic differentiation (GST) among the populations was found to be GST= 0.2380, estimated gene flow between population (Nm=1.6010), intra-population heterozygosity (HS=0.2457±0.0069) and total heterozygosity (HT= 0.3225±0.00133) clearly reflecting high genetic polymorphism. However, population wise, the genetic analyses in Tighra reservoir indicated lower genetic polymorphism (P) as 72.94% as compared to rest of two populations. Nei’s gene diversity (h) was observed as 0.2602±0.1514 in Upper Lake, 0.2464±0.1105 in Lower Lake and 0.2305±0.1705 in Tighra reservoir reflecting much higher gene diversity in Upper Lake population. A phylogenetic relation grouped 16 genotypes of three populations into three clusters which were in agreement with the each population. Current investigation depicted that, as compared to Upper Lake and Lower Lake fish populations, a genetic changes including reduced genetic diversity and significant differentiation have taken place in Tighra reservoir population as shown by allele richness, heterozygosity studies as well as pairwise GST structure. RAPD-PCR markers analysis was able to characterize the genetic divergence between the lentic populations and could be helpful tools for defining better management strategies of N. notopterus. However, further analyses using co-dominant molecular markers like mt-DNA marker is recommended to making find out the exact genetic gene flow diversity among and between the N. notopterus populations.
Keywords: Notopterus notopterus, RAPD, Gene diversity (h), gene flow (Nm), heterozygosity (HS, HT), relative differentiation (GST) polymorphism, conservation.