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COMPARATIVE ANALYSIS OF GENETIC DIVERSITY IN THE ENDANGERE D SHRUB TETRAENA MONGOLICA AND ITS RELATED CONGENER ZYGOPHYLLUM XANTHOXYLON
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2000
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BiologyGenetic DiversityBiodiversityConservation GeneticsVertical PolyPhylogeneticsMolecular EcologyNatural SciencesGeneticsEvolutionary BiologyMedicineEndangered Species BiologyGenetic VariationWestern Ordos PlateauPlant SpeciesPopulation GeneticsConservation Biology
Genetic diversity and differentiation in the endangered shrub Tetraena mongol ica were compared with those of its relative Zygophyllum xanthoxylon from the same habitat on the western Ordos Plateau using the method of vertical poly acrylamide gel electrophonesis. Allozyme data indicated that both plant species maintained a relatively high level of genetic variation as compared with other s hrubs. However the endangered shrub had lower population-level genetic variatio n, with P(Percentage of loci polymorphic)=60% and 83.3%, A(Mean No. of alleles p er locus) = 1 6 and 2.2, He(Mean expected heterozygosity) = 0.245 and 0.392 re spectively. Ge netic differentiation among populations was low with G st value being 0.051 and 0 .020 respectively. These results confirm that genetic issues are not the same, n or as pressing in all endangered plants, and that conservation strategies should therefore not all be the same.