RESEARCH ON POLYPLOIDY IN INTERSPECIFIC HYBRIDIZATION OF LILY
When within populations of interspecific hybrids more carefully was looked for pollen fertility, formation of polyploids in a more natural way by the formation of unreduced gametes was found as well. Wide interspecific lily hybrids (e.g. hybrids of the cross L. longi-florum x L. candidum and L. auratum x L. henryi) are usually completely male and female sterile. In rare cases, however, some fertile pollen was produced. It appeared that 100% of this pollen is 2n-pollen. In the less wide interspecific cross between the Asiatic hybrid 'Enchantment' and L. pumilum the fertile hybrids produce, besides normal n-pollen, a high percentage of 2n-pollen.