A. Siedlewska, ISOENZYMATIC DIFFERENTIATION IN PUTATIVE HYBRID SWARM POPULATION (PINUS-MUGO TURRA X P-SYLVESTRIS L) FROM TORFOWISKO-ZIELENIEC PEAT-BOG, Acta Societatis Botanicorum Poloniae, 63(3-4), 1994, pp. 325-332
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.