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Abstract The genetic diversity and genetic variation within and among four tea populations in Hunan were studied by RAPD markers. The result showed that 226 loci were detected by using 21 random primers (10bp) of which 162 loci were polymorphic (88.9%). Species genetic diversity indicated by Shannon's index was 0.43, 74.7% of which was due to within population genetic diversity and 25.3% among population variation. Species gene diversity indicated by Nei's index was 0.37, gene diversity within populations (HS) was 0.28, gene diversity among populations (HST) was 0.09 and the coefficient of gene differentiation (GST) among the populations was 0.23, 76.7% of which was within populations and 23.3% was among populations. The gene diversity estimated by Nei's index was consistent with that estimated by Shannon's index. These results suggest that there is rich genetic within population variation, which offers excellent prospects for seeding selection. The estimate of gene flow from GST (Nm) was 0.74, which indicated quite small genetic recombination between populations, it probably is related to environmental adaptations of four tea populations in Hunan and population isolation in their high mountain habitat.
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Received: 19 March 2007
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