NUCLEAR PORE COMPLEX IN SPERMATOGENESIS OF BEIJING DOMESTIC DUCK——ELECTRON MICROSCOPE OBSERVATION OF FREEZE-ETCHING

The nuclear pore complex in spermatogenesis of Beijing domestic duck has been studiedby means of electron microscopic observation of freeze-etching. The structure of the poreobserved proves to be in accord with the model of the nuclear pore complex proposed respec-tively by Franke (1970) and Roberts et al. (1970). But its central granule may be present(1--3 granules) or absent. The granules are considered to be material in transit. The sizeand frequency of the pore vary with different types of reproductive cells, which is believedto be related to the cells' function. The pores concentrate on the side of nucleus near Golgizone in primary spermatocyte and near the proacrosome of spermatid, and this shows thefunctional variety of parts in the nucleus.     

北京鸭精子发生的核孔复合体——冷冻蚀刻电子显微镜观察

本文应用冷冻蚀刻的电子显微镜观察研究了北京鸭精子发生的核孔复合体。核孔复合体的结构和Franke(1970年)和Roberts等(1970年)所分别提出的模型相一致。但是,中央颗粒可能有(1—3个)或可能没有,它可能是运输的物质。在各种生殖细胞中,核孔复合体的大小和密度是不同的,这显然和细胞的生理功能有关。核孔复合体集中在靠初级精母细胞的高尔基区一侧和靠精细胞的前顶体区一侧的核上,这表明了细胞核局部的功能差异。