Grant-in-Aid for Scientific Research (A).
|Allocation Type||Single-year Grants |
|Research Institution||Tokyo Metropolitan University |
FUYAMA Yoshiaki Tokyo Metropolitan University, Graduate School of Science, Professor, 理学研究科, 教授 (20087133)
OGUMA Yuzuru University of Tsukuba, Institute of Biological Sciences, Professor, 生物科学系, 教授 (90114074)
ISONO Kunio Tohoku University, Graduate School, of Information Science, Instructor, 情報科学研究科, 助手 (70124550)
INOMATA Nobuyuki Kyushu University, Faculty of Science, Instructor, 理学部, 助手 (20301335)
OISHI Kugao University, Faculty of Science, Professor, 理学部, 教授 (80030782)
KIMURA Masahito Hokkaido University, Graduate School of Environmental Earth Science, Professor, 地球環境科学研究科, 教授 (30091440)
山本 雅敏 京都工芸繊維大学, 繊維学部, 助教授 (10142001)
|Project Period (FY)
1998 – 2000
Completed (Fiscal Year 2000)
|Budget Amount *help
¥34,500,000 (Direct Cost: ¥34,500,000)
Fiscal Year 2000: ¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 1999: ¥10,800,000 (Direct Cost: ¥10,800,000)
Fiscal Year 1998: ¥15,100,000 (Direct Cost: ¥15,100,000)
|Keywords||speciation genes / host choice / fertilization gene / courtship song / mating behavior / parthenogenesis / amylase gene / artificial insemination / 適応進化 / ホスト適応 / 求愛歌と種認識 / 雑種雄不妊 / ホスト転換の遺伝的機構 / 遺伝子発現調節能の進化 / 雌による選択 / 単為発生 / 卵黄蛋白質 / 交配前隔離機構 / 交配後隔離機構 / 性フェロモン / 単為生殖の遺伝学|
1) Egg chorion was found to play an important role in the protection of embryos from toxic substances contained in the host plant of a monophagous Drosophila, D.sechellia.
2) Comparisons of amylase genes among D.melanogaster and related species provided evidence for natural selection.
3) Interspecific mating between Drosophila simulans females and males of closely related species was shown to be controlled by a number of species-specific, semidominant genes.
4) Light dependent mating activity of Drosophila male was shown to be determined by male visual acuity and was wavelength specific. The optical property of photo-receptor cells in the compound eye is involved in the visual information about mating.
5) Courtship songs of two sympatric Drosophila, D.ananassae and D.pallidosa were analyzed. It was concluded that Interpulse Interval (IPI) is not important in species recognition between the two species.
6) Cuticular unsaturated fatty acids and other unidentified sex pheromones was seemed to control mate choice found between the black and brown strains of Drosophila elegans.
7) Parthenogenesis discovered in 3 species of ananassae complex of Drosophila was shown to be caused by a gene located in common on the right arm of the second chromosome. Pronuclear duplication was suggested for the mechanism of diploidization.
8) In several hymenopteran insects, injection of heterospecific sperm into an unfertilized egg resulted in hybrid embryos which, however, failed to develop until adults. Heterospecific transplantation of ovary showed that yolk protein of different species could support normal development.
9) Mutants of D.melanogaster that were defective in spermatogenesis and fertilization were isolated, and several genes necessary for sperm storage in the female and for pronuclear fusion after fertilization were identified.