Genetic differentiation of adjacent populations of Scots pine (Pinus sylvestris L.) from different ecotopes.

摘要

The genetic structure of 2 adjacent populations of Scots pine from different ecotopes with a small gradient of ecological changes (near Nova Radcha in Zhitomir province of the Ukraine) was determined by PAGE analysis of isoenzymes governed by 22 loci. Significant difference between some characteristics of genetic variability (A, P95 and P99, and h? closely related to the proportion of rare alleles in a gene pool of populations was established, whereas heterozygosity and Wright's fixation index were only slightly different. The genetic distance calculated for 19 polymorphic loci was 0.017, which is more than twice that presented in the literature for neighbouring populations. The data obtained indicate that even a slight gradient of natural ecological changes leads to the appearance of a genetic barrier between adjacent populations of Pinus sylvestris.