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Electrophoretic Analysis of Genetic Variation within and between Populations of Quercus cerris, Q. pubescens, Q. petraea and Q. robur (Fagaceae) from Eastern Austria
Author(s) -
Samuel R.,
Pinsker W.,
Ehrendorfer F.
Publication year - 1995
Publication title -
botanica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0932-8629
DOI - 10.1111/j.1438-8677.1995.tb00497.x
Subject(s) - quercus petraea , biology , botany , population , quercus robur , hybrid , introgression , genetics , demography , sociology , gene
Allozyme variation at 14 loci was studied electrophoretically in 19 population samples of Quercus cerris, Q. pubescens, Q. petraea , and Q. robur . Genetic variation, measured as mean heterozygosity, was found to be high within populations but low among populations. A significant deficit of heterozygotes was observed in most of the populations of Q. pubescens, Q. petraea , and Q. robur . At the species level, Q. cerris (sect. Cerris ) appears to be clearly separated from the rest (sect. Quercus ). Q. pubescens, Q. petraea , and Q. robur form a cluster of closely‐related species. The degree of genetic differentiation among these species is low, i.e. in the range normally found among con‐specific populations. Nevertheless, allozyme data allow the elaboration of a dendrogram which is in reasonable accordance with the taxonomic classification, but also supports the importance of hybridization and introgression. This is also underlined by the fact that the allelic differentiation at the Got‐2 locus corresponds with the phenotypic classification ( petraea ‐like, hybrids, and robur ‐like) in samples from mixed populations.