Fourteen full-sib families of pedunculate oak (Quercus robur L.) were
utilized in order to study the segregation of isozymes and to verify t
heir mode of inheritance, Based on standard gel electrophoresis and is
oelectric focusing, a total of 12 enzymes systems were analyzed in see
ds, radicles (germinated seeds) and bud tissue, Tissue-specific expres
sion of isozymes was evident for one system. Fourteen enzyme systems w
ere controlled genetically by 15 polymorphic gene loci, A nomenclature
with respect to 76 codominant alleles is suggested, This nomenclature
includes polymorphism that was verified in various oak populations in
France and Germany, Confirmation of the genetic control of isozyme ba
nding pattern was based on single-locus segregation data, In most of t
he cases, the expected 1:1 or 1:2:1 Mendelian ratios were confirmed, D
eviations from Mendelian segregation proportions were found when paren
t trees were bearing rare alleles, The exceptions to these cases are d
iscussed, Analyses of two-locus genotypes revealed linkages in 20 out
of 83 tested crosses and resulted in the identification of two linkage
groups (Dia-A and Mr-A for group I and Aap-A, Lap-A, Idh-B, Pgi-B, an
d Acp-C for group II).