墨西哥湾扇贝精子的超微结构

Ultrastructure of the Spermatozoon of the Bay Scallop Argopecten irradians concentricus

报道了墨西哥湾扇贝成熟精子在SEM和TEM下的超微结构观察结果。墨西哥湾扇贝的精子为典型的原生型 ,精子全长约 43～ 45 μm ,头部长约 2 1～ 2 4μm。精子主要由头部、中段和尾部三部分组成。头部顶体明显突出 ,呈倒V形 ;顶体下方为细胞核 ,细胞核近似卵圆形。在细胞核内部或边缘 ,能观察到有一个或几个形状较为规则的核泡。中段的主要结构有线粒体和中心体 ,中段的横切面有 4个线粒体围绕在中心体的周围。尾部细长 ,尾部鞭毛横切面为典型的“9+2”结构。

Electron microscopy was used to reveal the morphology and structure of mature spermatozoon of the bay scallop Argopecten irradians concentricus. Spermatozoon are of the primitive type. The body and head length of spermatozoon are 43-45?μm and 2 1-2 4?μm respectively. The mature spermatozoon consists of head, middle section and tail. The acrosome is V shaped in upside down. Under the acrosome, the nucleus is egg shaped with high density. Nuclear vesicles are found in the nuclear region. Two centrioles and five large globular mitochondria are observed from middle section of sperm. The centrioles are of cylindrical hollow construction and are surrounded by four mitochondrial bodies. The tail is thin and long and the flagellum is a typical “9+2'microtubular structure limited by the cell membrane.