| Project/Area Number |
16K08101
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Insect science
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| Research Institution | Osaka City University |
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Principal Investigator |
Goto Shinsuke 大阪市立大学, 大学院理学研究科, 教授 (70347483)
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| Co-Investigator(Renkei-kenkyūsha) |
SHIGA Sakiko
TACHIBANA Shin-Ichiro
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | 昆虫 / 休眠 / 概日時計 / 母性効果 / 日長測定 / 光周性 / 内分泌系 / キョウソヤドリコバチ / ナミニクバエ / 遺伝子 |
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| Outline of Final Research Achievements |
Insects anticipate upcoming seasons by measuring day length (or night length) of a day. In the present study, we focused on two insect species, of which photoperiodic time measurement systems differ, to clarify the molecular and neurobiological mechanisms involved in photoperiodic responses. Although we were unable to clarify the location of the brain clock cells putatively involved in photoperiodic time measurement, we verified that biosynthesis of the juvenile hormone, that is synthesized in and secreted at the corpora allata, is under control of the photoperiodic time measurement system. In a fly, we clarified the exact location of clock cells in the brain and their oscillation patterns under distinct photoperiods. In addition, we clarified that distinct geographic variations in photoperiodic responses are based on the differences in the circadian clock systems governing photoperiodic time measurement.
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| Academic Significance and Societal Importance of the Research Achievements |
生物が日長に反応する性質である光周性は温帯の多くの生物に見られ，これらの生物が季節に適応するために必須の機構である．本研究は，日長読み取り機構が異なると考えられる２種の昆虫を用いて，光周性に関わる分子神経機構を解明することを目的とした．その結果，上述の成果をあげることができた．これらの成果は，昆虫の光周性機構の解明において重要な知見をもたらすものである．その成果の一部はすでに原著論文，総説，解説文として公開されており，本分野に携わる世界中の多くの研究者に大きな影響を与えている．また，国民の知的好奇心を刺激すべく，得られた成果の内容を市民講座などを通して社会に還元している．
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