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RAPD technique was applied to study intraspecific genetic polymorphism and differentiation of Suaeda acuminata populations in oasis-desert transitional zone in Fukang, Xinjiang. By analysis of RAPD data, higher genetic variability was found in the populations of S. acuminata, with a percentage of polymorphic loci of 98.9%. Both estimations by Shannon diversity index and by Nei's gene diversity index from RAPD data, it was found identically that about 72% of molecular variation existed within the subpopulations, while about 28% of which existed among subpopulations. Analysis of genetic identity, genetic distance and cluster analysis showed that genetic differentiation has taken place in the populations of Suaeda acuminata in oasis-desert transitional zone in Fukang, Xinjiang, China. The correlation analytical result between the soil factures and the genetic diversity indicted that there was a significant positive relation between genetic diversity and concentrations of Mg++, conductivity (CO) and absorbed water(W) in soil, while there was no significant relation between genetic distance among subpopulations and geographical distance. Analysis of genetic identity, genetic distance and cluster analysis between the five subpopulations showed that genetic differentiation has taken place in the population of Suaeda acuminata in oasis-desert transitional zone in Fukang, Xinjiang. No correlation existed between genetic distance among subpopulations and their locations in oasis-desert transitional zone. Adaptation to its habitats and restricted gene flow among subpopulations may be a cause of genetic differentiation of Suaeda acuminata population in oasis-desert transitional zone in Fukang, Xinjiang.
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