MORPHOLOGICAL AND MICROSATELLITE ANALYSIS OF PUTATIVE NATURAL HYBRID POPULATION BETWEEN LILIUM JAPONICUM AND L. AURATUM IN IZU PENINSULA, JAPAN
Lilium japonicum and L. auratum are endemic Japanese lilies, and have been used for parents in breeding of oriental hybrid lilies. L. japonicum has pink or white coloured funnel like flowers without spots, and is distributed mainly in the western part of Japan which includes Honshu (main island), Shikoku (west island) and Kyushu (south-west island). L. auratum has larger flowers with white tepals, yellow stripes and red spots, and is distributed on the eastern side of Honshu in Japan. The natural hybridization of these two species occurs only at the edge of their distribution which is on the South of Izu peninsula of Honshu main island. It is suggested that putative hybrids can be classified into three types by their morphological characters; L. japonicum type, intermediate type and L. auratum type, however their genetic structure has not been revealed yet. In this study, six wild populations of these lilies were investigated by morphological and genetic analysis. Principal component analysis by using ten morphological characters revealed large morphological diversity within putative hybrids. Five SSR markers are used for microsatellite analysis, and a Bayesian clustering approach was implemented by Structure analysis. In the Bayesian clustering L. japonicum was assigned to cluster I and L. auratum was assigned to cluster II. Putative hybrids were assigned to cluster I and II. These results indicate that putative hybrid populations consist of introgressed mixture between two species.
Yamamoto, S., Yamagiwa, Y., Inaba, Z. and Handa, T. (2014). MORPHOLOGICAL AND MICROSATELLITE ANALYSIS OF PUTATIVE NATURAL HYBRID POPULATION BETWEEN LILIUM JAPONICUM AND L. AURATUM IN IZU PENINSULA, JAPAN. Acta Hortic. 1027, 47-54
lily, introgression, SSR, hybrid zone, morphological variation