Genetic Control of Isozyme Systems and Heterogeneity of Pollen Contribution in beech (Fagus sylvatica L.)

1989

S. 195-201

4 Abb., 6 Tab., 29 Lit. Ang.

Unselbständiges Werk

200051099

The study of the alloenzymatic polymorphism and the genetic structure of beechwoods began some years ago, but until now, only few markers have principally been used. For common beech, several new loci, mostly polymorphous, are described in the present paper. The genetic control is carried out analysing the offspring of heterozygous mothers (in case of diallelic loci), asuming the codominance of the alleles for loci coding the MDH, 6PGD, PGI, and SOD systems and testing the segregation ratio 1:1. For the triallelic loci that control IDH and ACP isozyme variants, we only verified that the different genotypes observed in each offspring corresponded to the genotypes expected in the case of three codominant alleles. Additional some presumptions of the genetic control of PX3 and SKDH1 are given. Some markers were used for studying the variations of the allelic frequencies of the paternal contribution within three populations. In all cases, the paternal contribution is heterogeneous. This heterogeneity presents an inter-group and an intra-group components with allelic frequencies different as well for neighbouring trees as for isolated trees several hundred meters apart.