ユリの遠縁種間交雑に関する研究

Abstract

1. Phenotypic characters were investigated with new lily hybrids which were obtained from 15 crosses between distantly related species through embryo culture in combination with intrastylar pollination techniques.2. In general, the external features of these hybrids were intermediate between those of their parents and mostly resembled one another if crosses were carried out among nearly natural species. On the other hand, progenies derived from cultivars with genetic heterology, which had been employed as either seed or pollen parent, showed a wide variation of external characters.3. Flower colors deeper than those of either parent manifested themselves in some hybrids produced by the crosses of L. speciosum×L. henryi and L. ‘Shikayama’ ×L. henryi.4. Allotriploids containing two genomes (2x) derived from L. longiflorum and a genome (x) from another species were obtained in 5 combinations of crosses with L. longiflorunm as female parent. Each of them showed flower types that resembled those of L. longiflorum.5. These hybrids generally showed high pollen sterility though relatively high pollen fertility was also observed in combinations such as L. longiflorunm×L. ‘Hagoromo’ and L. ‘Shi kayama’ ×L. henryi. Such partial fertility may indicate the presence of close genetic relationship between certain parent species.6. Percent seed production by backcross showed very low values. Each set of the seeds produced in every combination was small in number and failed to germinate completely except for two combinations.