Intra- and Interpopulational Genetic Variation in Juvenile Populations of Quercus robur L and Quercus petraea Liebl : Genetics of Oaks. IUFRO Proceedings

Arboretum National des Barres

1993

S. 233-244

10 Lit. Ang.

Unselbständiges Werk

200041666

Annales des Sciences Forestieres 1993 ; 50,Suppl 1, S. 233-244

In each of 5 2-year-old populations of Quercus robur and Quercus petraea (single and multipopulation samples), genetic variation was quantified with respect to 13 polymorphic enzyme coding gene loci. Genetic control and inheritance of isoenzymes was verified beforehand by means of analyses of full-sib families. The observed average heterozygosities were 21.3% Quercus robur and 21.9% for Quercus petraea (conditional heterozygosities of 56.6 and 56.7 respectively). The mean number of alleles per locus is 3.2 for Quercus robur and 3.1 for Quercus petraea. The relatively small genetic diversities indicate minor polymorphisms. The genetic distances between pairs of samples indicate remarkable differences between populations. Most of the single population samples could be proven to share a smaller proportion of the entire gene pool than each of the multipopulation samples. There is a strong genetic similarity between Quercus robur and Quercus petraea in terms of common alleles. It is concluded that, more than in other species, large genetic variation must be incorporated into oak population in order to maintain the ability of these species to adapt to heterogeneous environments.