Inheritance of allozymes and hybridization in two European Tilia species.

Inheritance analysis of seven enzyme systems in hexaploid Tilia cordata Mill. was performed utilizing single trees and their open-pollinated progenies. Genetic analyses of 12 polymorphic gene loci showed that T. cordata had disomic inheritance despite being an allopolyploid. T. platyphyllos Scop. was also used in the investigations although no genetic inheritance analysis was carried out. In comparison with T. cordata, zymograms of 10 spontaneous T. cordata x T. platyphyllos hybrids showed markedly different banding patterns with species-specific alleles at 13 of the 14 described gene loci. Hence, differentiation between both species and their naturally occurring hybrid (T. x europaea) is easily feasible with allozyme studies.