Wolf K W
Institut für Biologie Medizinischen Universität zu Lübeck, F.R.G.
Biosystems. 1990;24(1):5-15. doi: 10.1016/0303-2647(90)90024-u.
The restructuring of spermatocytes during the first meiotic division is examined in the moth Orgyia antiqua (Lymantriidae, Lepidoptera) using transmission electron microscopy. Particular emphasis was placed on the behaviour of the perispindle membrane system. These membranes develop from layers of smooth endoplasmic reticulum wrapped around the prophase I nucleus and are retained until early telophase I. The original nuclear envelope is dissolved in metaphase I. Polar fenestrae in the perispindle membrane stacks are filled with numerous irregular membrane elements. The formation of new nuclear envelopes around the daughter nuclei takes place inside the perispindle membrane system. Finally, the membrane stacks rupture concomitantly with spindle elongation in late telophase I. Thus, division of primary spermatocytes in Orgyia antiqua has a surprising degree of similarity with the so-called closed mitosis. This mode of division is typical for many protozoa, algae and fungi. In the pertinent cells, the original nuclear envelope persists around the spindle area during nuclear division. In order to distinguish the closed mitosis from the situation in Orgyia antiqua spermatocytes, the term 'sheathed nuclear division' is suggested for the latter.
利用透射电子显微镜对古毒蛾（鳞翅目，毒蛾科）第一次减数分裂过程中精母细胞的重组进行了研究。特别强调了纺锤体周围膜系统的行为。这些膜由包裹在前期I细胞核周围的滑面内质网层发育而来，并保留到前期I早期。原始核膜在中期I溶解。纺锤体周围膜堆栈中的极窗充满了许多不规则的膜元件。围绕子核形成新的核膜发生在纺锤体周围膜系统内。最后，膜堆栈在后期I末期随着纺锤体伸长而破裂。因此，古毒蛾初级精母细胞的分裂与所谓的封闭有丝分裂有惊人的相似程度。这种分裂方式在许多原生动物、藻类和真菌中很典型。在相关细胞中，原始核膜在核分裂期间在纺锤体区域周围持续存在。为了将封闭有丝分裂与古毒蛾精母细胞的情况区分开来，建议将后者称为“鞘核分裂”。
