版纳青梅居群的遗传多样性和群体分化

我国龙脑香科特有种版纳青梅(Vatica

Genetic Diversity and Population Differentiation of Vatica guangxiensis

The ganetic diversity and population differentiation of an endemic Dipterocarp, Vatica guangxien- sis,were wxamined using allozyme analysis of horizontal sliceable starch gel electrophoresis.It is dintributed in Mengla of Southern Yunnan and Napo of Southwest Guangxi only.Aallozyme data for 23 loci of 14 en- zymes indicated low level of genetic diversity with the proportion of polyrphic loci(P)ranging from 13.0% to 21.7%, average number of alleles per locus (A)from 1.1 to 1.2,average number of alleles per locus (A)from 1.1 to 1.2 ,average expected (He) and observed (Ho) heterozygosity per locus from 0.056 to 0.130 and 0.055 to 0.130,respectively.Wright's F statistics analysis suggested the high level of subpopulation differentiation (GST=0.265).The inbreeding and gravity dispersal of seeds contributed to the high subpopulation differentiation. Another possible reason of high differentiation ,could be from the reduced population size that induced the genetic drift.Furthermore,it supported the combination of V.guangxiensis and V. xishuangbannaensis.