太平洋牡蛎二倍体和三倍体卵母细胞发育的超微结构

本文利用电子显微镜比较研究了太平洋牡蛎二倍体和三倍体卵母细胞发育过程中细胞和各细胞器的超微结构变化。结果表明，在卵黄形成期，二倍体卵母细胞呈椭圆形，细胞器发达，细胞外布满微绒毛，卵黄粒多并均匀分布于细胞质中，卵母细胞生物合成旺盛，代谢活动强；而三倍体卵母细胞呈长条形或不规则形，细胞器少，不发达，细胞外未观察到微绒毛，卵黄粒少，有些细胞的卵黄粒畸形，卵母细胞生物合成及代谢弱。

THE ULTRASTRUCTURE OF DEVELOPMENT IN OOCYTES OF DIPLOID AND TRIPLOID OYSTER, CRASSOSTREA GIGAS

Comparative study of ultrastructure of oocytes and various organellae was conducted on diploidy and triploidy oyster, Crassostrea gigas, during their oocyte development by means of electronic microscope. The results indicated that, during the period of vitellogenesis, oocytes of diploidy oyster were oval shaped with developed organellae and numerous yolk granellae evenly distributed in cytoplasm. Microvilli circled round oocytes. Biosynthesis and metabolism activated inside. In contrast , most oocytes of triploids were in oblong or irregular shape, with a small amount of organellae and fewer yolk granules, the latter in some oocytes was even deformed. No microvilli were observed outside oocytes. Weak biosynthesis and metabolism occurred. Hindered oogenesis of triploid oyster revealed that development of their oocytes was blocked in vitellogenesis phase.