engleski

Genetic structure of Fagus silvatica L: populations in Southeastern Europe

Genetic structure of 38 populations from southeastern Europe has been studied using 11enzymatic gene loci (PX-1, PX-2, GOT-1, 6-PGD-1, SOD-1, ACP-1, MDH-1, IDH-1, PGM-1, PGI-1 and MNR-1). Eight loci are polymorphic with gene diversity ranging from o.179 to 0.461. Principal component analysis (PCA) by based on allelic frequncies extracted 4 groups of populations: Rhodopes, Shars-Pindus range ; Dinaric Alps and Low Pannonic Mountain ranges ; Biokovo Mountain and Istrian Peninsula, well associated with geographical and climatic conditions. The statistical significance of this grouping was tested by discriminant analysis (DA). Although all 4 derived groups have high and similar values of the totaldiversity (respectively 0.250 ; 0.228 ; 0.282 ; 0, 264), the share of loci which are more poliymorfic varies from group to group. Presence of some rare alleles also indicates the difference between them. The correlations between estimated genetic differences and presumed occurences during the glaciation and postglaciation periods have been discussed, especially microgeographical conditions and evolutionary history of beecwoods from isolated regions of Biokovo and Istria. Multilocus F- statistic have also been computed. Positive F-IT values for all groups of populations indicate some deficit of heterozygotes, while high F-ST values prove certain differentiation among them.

Fagus Silvartica; isozymes; genetic structure; geopraphic variations; recolonization

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