ISOENZYMATIC DIFFERENTIATION IN PUTATIVE HYBRID SWARM POPULATION (PINUS-MUGO TURRA X P-SYLVESTRIS L) FROM TORFOWISKO-ZIELENIEC PEAT-BOG

Isoenzyme variability of eight groups of individuals from different pa rts of putative hybrid swarm population (P. mugo Turra x P. sylvestris L.) from ''Torfowisko Zieleniec'' peat-bog complex was studied at ten enzymatic loci. Differences in allelic frequencies distribution among particular samples of the Zieleniec population were statistically sig nificant at 9 loci, as shown by G(2)-statistics. Chi-square test indic ated that in each of studied subpopulations frequencies of alleles at some loci (2-5) differed significantly from frequencies expected for a homogeneous population. Heterozygosity values and also a genotypic po lymorphism in studied population confirmed the existence of large gene tic variation. Wright's fixation indices (F) showed some excess of hom ozygotes in majority studied groups of individuals, notably higher in some subpopula-tions. Gene diversity coefficient for 8 subpopulations was high (G(ST) = 9.4%). However, when MDH C locus was excluded from t he calculation, its value decreased to 2.8%. Presented data demonstrat ed notable differentiation of subpopulations within studied pine popul ation, comparable with the differentiation among different populations of coniferous species.