WEKO3
アイテム
Ascidian Fertilization : Its Morphological Aspects
https://ncu.repo.nii.ac.jp/records/67
https://ncu.repo.nii.ac.jp/records/67ddc470f9-192d-40fe-98a2-eb91a854adb7
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
B43-19970300-9.pdf (4.6 MB)
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| アイテムタイプ | 紀要論文2 / Departmental Bulletin Paper(1) | |||||||
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| 公開日 | 2013-02-23 | |||||||
| タイトル | ||||||||
| タイトル | Ascidian Fertilization : Its Morphological Aspects | |||||||
| 言語 | en | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| キーワード | ||||||||
| 言語 | en | |||||||
| 主題Scheme | Other | |||||||
| 主題 | acrosome | |||||||
| キーワード | ||||||||
| 言語 | en | |||||||
| 主題Scheme | Other | |||||||
| 主題 | acrosome reaction | |||||||
| キーワード | ||||||||
| 言語 | en | |||||||
| 主題Scheme | Other | |||||||
| 主題 | apical process | |||||||
| キーワード | ||||||||
| 言語 | en | |||||||
| 主題Scheme | Other | |||||||
| 主題 | fertilization | |||||||
| キーワード | ||||||||
| 言語 | en | |||||||
| 主題Scheme | Other | |||||||
| 主題 | Ascidians | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||
| 資源タイプ | departmental bulletin paper | |||||||
| 著者 |
Fukumoto, Makoto
× Fukumoto, Makoto
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| 抄録(英) | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | The ascidian spermatozoa have an acrosome(s) albeit a small one. In Ciona intestinalis and Halocynthia roretzi spermatozoa the acrosome reaction occurs by fusion between the plasma membrane overlying the acrosome and the outer membrane of the acrosome at its peripheral margin. A flat sac bounded by hybrid membranes of the acrosomal outer membrane and the overlying plasma membrane forms at the sperm tip. Membrane fusion proceeds along the peripheral margin of the acrosome. The hybrid sac transforms into a vesicle that eventually detaches from the tip of the sperm head. During this process acrosomal substance is released. This type of acrosome reaction actually occurs in the perivitelline space after passage through the chorion during the fertilization of H. roretzi. This is a new type of acrosome reaction which has not been described previously. In H. roretzi sperm can pass through the chorion with an intact acrosome leaving a distinct hole in the chorion. This suggests that chorion lysin(s) are nondiffusible and intercalated into the plasma membrane enclosing the sperm head. It has been proposed that the fuzzy extracellular material (surface ornament) at the tip of the sperm head in ascidians is the site where the lysin(s) are found and that it plays an important role sperm-chorion interactions at fertilization. In the perivitelline space apical processes protrude mainly from the peripheral region of the apex of the acrosome-reacted sperm head. Gamete fusion occurs between some of these processes and the egg plasma membrane resulting in the incorporation of the sperm into the egg from the anterior tip of its head in the same way that it does in other marine invertebrates. In this respect the apical process may be functionally homologous to the acrosomal process(s) of some other marine invertebrates. Morphological studies on ascidian species with external fertilization have made the sequential events associated with fertilization clearer. There are many other groups of ascidians in which fertilization is internal. For a satisfactory understanding of the general mechanisms of ascidian fertilization intensive studies on the morphological events associated with the internal fertilization are indispensable. | |||||||
| 書誌情報 |
en : Annual review 巻 1, p. 9-30, 発行日 1997-03 |
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| ISSN | ||||||||
| 収録物識別子タイプ | ISSN | |||||||
| 収録物識別子 | 13429329 | |||||||
| 書誌レコードID | ||||||||
| 収録物識別子タイプ | NCID | |||||||
| 収録物識別子 | AA11168811 | |||||||
