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Allozyme Variation in Korean Populations of Taxus cuspidata (Taxaceae)

The genetic diversity and structure of six Korean populations of Taxus cuspidata Sieb. et Zucc., a widespread and dioecious tree native to east Asia, was examined. Although Korean populations are isolated and located over 1000 m a.s.l., they maintain moderate levels of allozyme variation (average percent of loci polymorphic=45%, mean number of alleles per locus=1.78, mean expected heterozygosity=0.192) compared to species with similar life history and ecological traits. In addition, Korean populations harbour slightly higher levels of genetic diversity than populations of T. breuifolia Nutt. in the western United States and Canada. A considerable, high level of heterozygote deficiency was observed in Korean populations of T. cuspidata (mean F IS=0.299). Although significant heterogeneity in allele frequency were detected between populations at all 12 polymorphic loci (p<0.01 at Per-2 and p<0.001 at others), among-population genetic differentiation accounted for 5.6% of the total variation. Indirect estima...