黑脊倒刺Ba生精细胞拟染色体的形成过程

用电子显微镜观察了黑脊倒刺Ba生精细胞中拟染色体的形成过程。拟染色体在初级精原细胞中形成。在初级精原细胞的细胞核中，拟染色体前体物质先附着于核膜内侧，该处核膜崩溃。并在拟染色体前体物质的内侧，新核膜形成。新核膜将拟染色体前体物质分隔出细胞核之外。新核膜呈凹陷状。拟染色体前体物质集中于该凹陷中，并聚集成拟染色体。新核膜上有较大的空隙。核内还有少量拟染色体前体物质通过该空隙进入核表面的凹陷中，并结合到拟染色体上。黑脊倒刺Ba生精细胞拟染色 体的形成方式与通常认为的核内物质通过核孔排出核外的方式不同，似可表明核内物质向外运输存在着另一种机制。拟染色体形成后不久就与线粒体结合，并离开核凹。在以后的发育过程中，拟染色体又与线粒体分离。

The formation process of chromatoid body in spermatogenic cell of teleost, Spinibarbus caldwelli (Nichols)]

The formation process of chromatoid body in spermatogenic cell of teleost, Spinibarbus caldwelli (Nichols) was observed with electron microscopy. The chromatoid body was formed in the primary spermatogonium. First, the precursor of chromatoid body adhered to the inner surface of the nuclear envelope. The nuclear envelope where the chromatoid body adhering was destroyed. At the inner side of the precursor of chromatoid body, new nuclear envelope formed. It separated the precursor of chromatoid body from nucleus. The newly formed nuclear envelope was concaved. Thus a hollow appears on the surface of the nucleus. The precursor of chromatoid body gathered in the hollow and condensed into chromatoid body. There were many big gaps on the newly formed nuclear envelope. A little precursor of chromatoid body which had not been separated from the nucleus before comed out of the nucleus through these gaps and into the hollow, where it integrated with the chromatoid body. The way of chromatoid body formation in spermatogenic cell of Spinibarbus caldwelli was different from the way by which nuclear material comes out of the nucleus. It was suggested that there was a different way by which nuclear material could go out of the nucleus. The chromatoid body combined with mitochondria soon after it was formed, and left the hollow. During the development of the spermatogonium, the chromatoid body separated from mitochondria.