1987 Fiscal Year Final Research Report Summary
Structural changes of photoreceptive membranes in marine invertebrate photoreceptors.
| Project/Area Number |
61540519
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
動物発生・生理学
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| Research Institution | Okayama University |
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Principal Investigator |
YOSHIDA Masao Okayama University, Professor, 理学部, 教授 (50032793)
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| Co-Investigator(Kenkyū-buntansha) |
OHTSU Kohzoh Okayama University, Research Associate, 理学部, 助手 (20033194)
YAMAMOTO Masamichi Okayama University, Associate Professor, 理学部, 助教授 (50011565)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Amphioxus / Hemigrapsus sanguineus / Joseph cell / Lamellated cell / Hesse cell / Rhabdomeric type photoreceptor / 絨毛型視細胞 / 膜のターンオーバー |
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| Research Abstract |
Joseph cells, lamellated cells and Hesse organs which have assumed to function as photoreceptors in amphioxus were studies electronmicroscopically. A histofluorescence method to show the presence of retinal was also used.
Joseph and Hesse cells are both composed of microvilli at periphery, cell body and an axon. Hesse cells are lined in addition by a pigment cell. By dark adaptation, microvilli of both cells increase in number and become slender and more regulary arranged. The fluorescence specific for retinal is induced at the site where the microvilli of Joseph and Hese cells are located.
Each lamellated cell is provided with lamellae which are originated from the sheath of cilium with 9+0 axonemes, cell body and an axon. These cells did not change in ultrastructure upon light treatment, nor did they show the fluorescence specific for retinal. This does not necessarily disprove, however, the photoreceptive function of lamellated cells.
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