CHANGES OF GENETIC-STRUCTURE OF PINUS-SYLVESTRIS L POPULATIONS EXPOSED TO INDUSTRIAL-POLLUTION

Isoenzymatic variation of Pinus sylvestris was analysed in populations from a provenance trial (IUFRO 1982) in Kornik and their replication in Lubon. The two groups of populations originated from the same seed pool, but the one in Lubon was exposed to pollutants emitted during th e production of nitrogen-phosphorus fertilizers,while the Kornik prove nance trial were used as a control group. The parameters determining t he genetic structure of the studied populations - frequency of alleles and genotypes (average number of alleles and genotypes per locus), ob served heterozygosity (H-o), and genotypic polymorphism index (P-g) - have higher values in the group of trees tolerant to pollution. Also f ixation index (F), which indicates that homozygotic genotypes underwen t selection in this group, as well as dendrites and dendrograms accord ing to Nei and Hedrick, suggest that the genetic structure of the popu lations exposed to pollution was changed. The obtained results indicat e that populations characterized by a greater genetic diversity are mo re tolerant to pollution.