| Project/Area Number |
13839007
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生物多様性・分類
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| Research Institution | Ochanomizu University |
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Principal Investigator |
HATTA Masayuki Ochanomizu University, DEPARTMENT OF BIOLOGY, ASSOCIATED PROFESSOR, 理学部, 助教授 (00249947)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2002: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | CORAL / METAMORPHOSIS / NEUROPEPTIDE / MARINE BACTERIA |
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| Research Abstract |
It is thought that larvae of the coral Genus Acropora regulate a sequence of settlement and meatmorphosis in response to environmental cues and following internal reactions. As candidates for such environmental cues, bacteria were screened to isolate strains that have positive or negative effects on metamorphosis and settlement of acroporids' larvae. A complicated aspect turned out that larvae settle on places where low rates of positive bacteria and higher rates of negative bacteria habit together.
By assessing artificially acid substitutions, critical structures of the hormone were determined. Precise action of the metamorphosis-inhibiting peptide hormone was also investigated. It can block the metamorphosis induction by the inducing hormone, although the inhibitory action is temporal due to loss of the sensitivity to the ligand in Acropora. This feature is characteristic for Acropora compared to the sustainable response of marine hydrozoans.
Effects of two metamorphosis-inhibiting bacteria were investigated, and it was figured out that one act temporally and another for long time and that the both cause the inhibitory effects via independent pathways, independent from each other and from the inhibiting hormone.
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