【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。更多还原

【Abstract】 Mature females of Sinonovacula constricta were collected from the intertidalzone at Xiamen Island from September to October of 1985. Transmission electronmicroscope observation of the ultrastructural features of the oocyte of the clam were observed during vitellogenesis. At the early vitellogenic stage, there were a greatnumber of smalI dense masses without membrane which obviously derive from theaggregation of flocculent material and vesicles in the cytoplasm. These masses growin 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 developingyolk granules, transforme onto yolk globules, endoplasmic reticulum (ER) is also involved in vitellogenesis in varied ways: Some dense vesicles produced by ER incnrporate into other yolk granules, while some sacs of ER which surround mitochondriaand electron dense material, or surround developing yolk granules participate directly in the formation of yolk. The aggregation of Golgi vesicles, and the coalesionamong them, on the surface of aggregating yolk granules imply the re1ationship between these vesicles and the formation of the limeted 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 clearvesicles formed by rough ER and annulate lamellae transform into smooth vesicles,and then form lipid dropletes by amalgamation.更多还原