-Allozyme variation parameters have been estimated and compared among four P. pallasiana D. Don plantations located in the Ukraine steppes and in three Crimea natural populations. The analyses also concerned three groups of trees selected for their possible tolerance/ resistance to steppe conditions and to industrial pollution. The polymorphic loci percentage in the natural populations varied from 0.74 to 0.89 and the allele mean number varied from 2.4 to 2.7. Among the artificial plantations these values varied from 0.75 to 0.85 and from 2.35 to 2.75 respectively. Heterozygote deficiency (14.9%) was characteristic of 6 of the 7 stands examined. Instead, a heterozygote excess (14.6 to 36.9%), but less allele diversity, was revealed among groups of selected trees. Nei's genetic distances averaged to 0.010 when comparing natural and artificial populations. Parameters measured on selected groups and on natural populations from the steppes showed an absence of inbreeding depression. The results of this study lead to a recommendation that these trees be used as the basic material in extensive plantation programs of P. pallasiana in the Ukraine steppes, including polluted areas. Pinus pallasiana

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