| 摘要: |
| 于1985年9－10月，从厦门沿海滩涂采回缢蛏雌性亲贝，利用透射电镜观察卵母细胞卵黄发生过程的超微结构变化。结果表明，多数卵黄球首先是通过聚集方式形成的。游离于胞质中的絮状物质和小泡先聚集而成致密无膜的小团，随后逐渐增大，并与不同来源的颗粒或小泡融合，最终形成具膜的、圆形的卵黄球。线粒体、高尔基体、内质网及微吞噬作用形成的颗粒等均以不同的程度参于卵黄发生。来源于内质网和环孔瓣状体的光面小泡可转化形成脂滴。 |
| 关键词: 缢蛏 卵黄发生 超微结构 |
| DOI： |
| 分类号: |
| 基金项目:厦门大学校科研基金资助项目，561号 |
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| ULTRASTRUCTURAL STUDIES ON THE FORMATION OF YOLK. GLOBULE OF THE OOCYTE IN SINONOVACULA CONSTRICTA |
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Shangguan Bumin, Liu Zhengcong
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Department of Oceanography, Xiamen University, Xiamen 361005
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| Abstract: |
| Mature females of Sinonouacula constricta were collected from the intertidal zone at Xiamen Island from September to October of 1985. Transmission electron microscope observation of the ultrastructural features of the oocyte of the clam were observed during vitellogenesis. At the early vitellogenic stage, there were a great number of small dense masses without membrane which obviously derive from the aggregation of flocculent material and vesicles in the cytoplasm. These masses grow in size (resembling amalgamating process) or by direct coalescence with other cytoplasmicgranules and, at last, develop into mature yolk globules covered with membrane. The granules deriving from mitochondria, by combining with other developing yolk granules, transform onto yolk globules, endoplasmic reticulum (ER) is also involved in vitellogenesis in varied ways: Some dense vesicles produced by ER incorporate into other yolk granules, while some sacs of ER which surround mitochondria and electron dense material, or surround developing yolk granules participate directly in the formation of yolk. The aggregation of Golgi vesicles, and the coalesion among them, on the surface of aggregating yolk granules imply the relationship between these vesicles and the formation of the limited membrane of the yolk globule. The fact that the granules produced by microphagocytosis combine with yolk granules indicates that a part of vitellin material originates extracellularly. Some clear vesicles formed by rough ER and annulate lamellae transform into smooth vesicles, and then form lipid dropletes by amalgamation. |
| Key words: Sinonouacula constricta, Vitellogenesis, Ultrastructure |
