nterspecific hybridization of Lilium allows to investigate mechanisms of reproduction isolation barriers. To overcome fertilization barriers in incongruous crosses, cut style pollination and pollination of native style by mixed pollen were performed. Cut style pollination allowed overcoming pre fertilization barriers only in cases when cultivars from division Asiatic hybrids were pollinated by Lilium pumilum DC. and L. concolor Salisb. Crossing of Asiatic hybrids as females with L. monadelphum M. Bieb., L. regale E. H. Wilson and L. candidum L. or crossing L. martagon L. with Trumpet hybrids and Oriental hybrids were successful when mixed pollen of incongruous species were used for pollination. Inheritance of species specific molecular markers allowed screen progeny of Asiatic hybrids crossed with L. candidum and Asiatic hybrids crossed with L. regale. It was found that hybrids resulted from crossing Asiatic hybrids with L. concolor were male and female fertile while hybrids between Asiatic hybrids and L. pumilum were only male fertile.
Keywords: Lilium, interspecific hybridization, reproductive isolation, inheritance.