Genetic variability among beech (Fagus sylvatica L.) populations from the Sudety Mountains, in respect of peroxidase and malate dehydrogenase loci.

Individual trees growing in five populations of European beech (Fagus sylvatica L.) in the Sudety Mountains were investigated in respect of variability of peroxidases (2 loci) and malate dehydrogenase (1 locus). Differences between populations were illustrated by a dendrogram constructed on the basis of Hedrick's (1974) genetic distances. The mean GST coefficient (=0.0333) value demonstrated the higher level of intra-population variability, as compared to the inter-population (DST = 0.0149) variability.

Variability of cathodic peroxidases in sugar beet (Beta vulgaris L.) cultivars.

Eighteen varieties of sugar beet (Beta vulgaris L.), originating from various European countries, were compared in respect of peroxidase variability level. They were cultivated in the same experimental plot. The cultivars differed in ploidy level: one variety was tetraploid, three were diploid and 14 varieties were triploid. The cathodic peroxidase system is controlled by four independent genes, of which only one is polymorphic. Consequently, the varieties were characterised by frequencies of 3 allozymes belonging to one locus. Only one variety proved to be fully monomorphic. Genetic similarities between the cultivars were illustrated by a dendrogram (UPGMA) and show different groups of varieties not related to their ploidy level.