3种珍珠贝精子发生及其超微结构的比较研究

在透射电子显微镜下观察合浦珠母贝（Ｐｉｎｃｔａｄａｆｕｃａｔａ）、大珠母贝（Ｐｉｎｃｔａｄａｍａｘｉｍａ）和企鹅珍珠贝（Ｐｔｅｒｉａｐｅｎｇｕｉｎ）的精子发生及精子形态．结果表明．大珠母贝从精原细胞到精子，核内都有数量不等的板层小体（ｎｕｃｌｅａｒｌａｍｅｌｌａｒｂｏｄｙ）；企鹦珍珠贝从精原细胞的晚期直到精子细胞早期，大多数细胞出现核内包含体（ｎｕｃｌｅａｒｉｎｃｌｕｓｉｏｎ）；而合浦珠母贝的生精细胞核无特殊结构．合浦珠母贝在初级精母细胞时由高尔基体分泌形成前顶体粒；企鹅珍珠贝的前顶体粒主要在次级精母细胞和早期精子细胞阶段形成。虽然大珠母贝的各级生精细胞中都没有出现典型的高尔基体，但前顶体粒仍在精母细胞时期形成。三种贝的精子结构均为典型的原生型，由头部、中段和尾部构成．合浦珠母贝精子的顶体最长，中段的线粒体数有变异；大珠母贝的精子核最高，其中含有板层小体；而企鹅珍珠贝精子中段的体积是最大的．

A COMPARISON ON THE SPERMATOGENESIS AND ULTRASTRUCTURE OF SPERMATOZOA OF THREE SPECIES OF PEARL OYSTERS(BIVALVIA)

The spematogenesis and structure of spermatozoa of pearl oyster, Pinctada fucata,Pinctada maxima and Pteria penguin was observed under electron microscope. The results micdicate that there are some endonuclear lamellar bodies (ELB)in the nuclues through out the spermatogenesis of P. maxima;some nuclear inclusions in most of the spermatogonia, spermatocytesand spermatids of Pteria penguin; and no specific structure in all kinds of spermtogenic cells ofP.fucata.The Golgi body which was related to the foumation of proacrosomal granules can beobserved in the spermatocytes of P.fucata;It can also be seen in the late spermatogonium stageand in the early spermatid stage in Pteria penguin. There are, however, not any typical Golgibody in all of spermatogenic cells of P. maxima; its proacrosomal granules,which can fuse withthe ELB to constitute acrosome in spermatid, also formed in the spermatocyte.The spermatozoaof three species belong to primitive type. which consists of the head,the midpiece and the tail.of all the species,the acrosome of P.fucata is the longest;the nucleus of spermatozoon of P.maxima,the highest; and the midpiece of Pteria penguin, the largest.The different densityzones are also be found in the acrosome of those species.