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Jitlam Natenapit,Tetsuto Nagamidori,Seiichi Fukai 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.3
Restoration of pollen germination ability using high temperatures was investigated in Oriental-Trumpet (OT) and Longiflorum-Asiatic (LA) triploid lily hybrids. The flower bud size relation to the pollen development stage was determined through microscopic observation of flower buds from plants grown in a growth chamber at 20℃. Pollen was collected from plants treated with 30℃ for 7 days and lowered to 20℃ until flowering. A sequence of events in meiosis was found in 20-32 ㎜ flower buds of ‘Vinadelmar’, 31-39 ㎜ of ‘Ventimiglia’, 32-38 ㎜ of ‘Manissa’, 32-40 ㎜ of ‘Conca d’Or’, and 14-22 ㎜ of ‘Ballroom’. Individual flowers showed considerable differences in developmental stages. Increased germination was shown as 8.4±1.2% in flower buds of 17-35 ㎜ in ‘Ventimiglia’; 2.7±1.0%, 21-35 ㎜ in ‘Manissa’; 4.6±1.3%, 21-35 ㎜ in ‘Conca d’Or’, respectively. Pollen was used in crossings with L. × formolongi, trumpet hybrids, Oriental hybrids, and diploid OT hybrids; a few plants were obtained but they died at the early stage of seedling development. These results demonstrate that high-temperature treatment is a promising method to restore pollen fertility. The flower bud is expected to have anthers in meiosis during high-temperature treatment; the appropriate flower bud size differed slightly depending on the genotype.
Crossing of Allotriploid LLO Hybrid and Asiatic Lilies (Lilium)
Jitlam Natenapit,Shin Taketa,Takako Narumi,Seiichi Fukai 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.5
Triploid LLO hybrids were crossed with Asiatic hybrids. The triploid was derived by crossing somatic chromosome doubled LO hybrid (Longiflorum × Oriental) backcrossed with L. Genomic in situ hybridization showed that the LLO hybrid had 24 L chromosomes and 12 O chromosomes with no recombination. Crossing of the allotriploid LLO as the ovary parent with diploid Asiatic hybrid (A) produced some progenies, which were aneuploid, near-diploid, or -triploid containing L, O, and A chromosomes. Numbers of L and A chromosomes were stable (12 chromosomes) with one exception, which had 14A chromosomes. The number of O chromosomes varied from 3 to 10. One progeny (LLO × A) exhibited a chromosome recombination of L and O, indicating that recombination can occur in meiosis of an allotriploid (LLO) ovule.