| Project/Area Number |
23658044
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Applied entomology
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| Research Institution | Hirosaki University |
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Principal Investigator |
HIRUMA Kiyoshi 弘前大学, 農学生命科学部, 教授 (70374816)
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 昆虫生理学 / 脱皮行動誘導ホルモン / 幼若ホルモン / 変態 / 行動 / 脱皮 |
|---|
| Research Abstract |
Ecdysis triggering hormone (ETH) produced by Inka cells is a peptide hormone that induces insect ecdysis. We found that (1) ETH mRNA expression occurred in the corpora allata (CA) shortly before the last larval ecdysis, (2) EHT stimulated juvenile hormone (JH) biosynthesis by CA, and this stimulative action was observed primarily 6 hr before the last larval ecdysis, which was corresponded with the increase in JH synthesis during the molt. These results indicate that the increase in the JH titer during the last larval molt is due to the ETH action. Thus, a single hormone mediates two different phenomena, behavior and growth; a hormone that is responsible for behavior regulates JH synthesis, a key hormone involved in growth and metamorphosis.
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