Study on the mechanism of mixis induction of marine rotifers and it application to mass production of resting eggs.
| Project/Area Number |
16580153
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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 |
General fisheries
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| Research Institution | Nagasaki University |
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Principal Investigator |
HAGIWARA Atsushi Nagasaki University, Graduate School of Science & Technology, Professor, 大学院生産科学研究科, 教授 (50208419)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | rotifer / mixis induction / resting egg / aging / gene |
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| Research Abstract |
1.Molecular basis of mixis induction of marine rotifers
Total RNA was purified for amictic, fertilized mictic, unfertilized mictic females and males, and synthesized cDNA. Cloning of specific expressed genes was conducted by DD-PCR obtained. Six gene fragments only specific in mictic females may have a function of rotifer sexual reproduction.
2.Inbreeding of rotifer strains by crossing and environmental control
By crossing Tokyo and German rotifer strains showed lower sexual reproduction rate compared to parental strains, while the population growth rate was 13 to 19% larger. Crossed strains did not produce resting eggs, and some did not induce male production. By starving neonates for 6 hours after resting egg hatching, subsequently obtained rotifer clone showed enhanced resting egg production.
3.Mass production of resting eggs
For this experiment, I used a rotifer strain obtained from environment control, We used four 1m^3 tank and could produce 4x10^8 resting eggs, which was 4 to 5 times more efficient than previous data.
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Report
(3 results)
Research Products
(14 results)
