肾蕨颈卵器中轴列细胞发育的超微结构研究

ULTRASTRUCTRUAL STUDIES ON AXIAL ROW CELL DEVELOPMENT IN ARCHEGONIUM OF NEPHROLEPIS CORDIFOLIA

利用电子显微镜对肾蕨颈卵器中的中轴列细胞发育进行了超微结构的研究.肾蕨颈卵器中轴列细胞由1个卵细胞、1个腹沟细胞和4个颈沟细胞组成.其中卵细胞是中轴列细胞中最重要的细胞.卵细胞在刚刚形成时,细胞核椭圆形,核仁明显,细胞中细胞器丰富,随着卵细胞的发育,卵细胞与周围细胞间形成分离腔,并在表面出现附加膜,同时核伸长呈新月形,形成核外折的结构.本文重点报道了卵细胞发育过程中附加膜、分离腔的形成以及细胞核和细胞器的形态与分布的变化,同时探讨了卵细胞的结构变化在受精过程中的重要作用.

Development of axial row cells of Nehprolepis cordifolia archegonium was examined with transmission electronic microscopy. Axial row of archegonium consisted of an egg, ventral cell and four neck-- canal cells, the egg being the most important. Nucleus was oval and nucleolus was evident in young eggs. There were abundant organelles in cytoplasm of young eggs. Subsequently, separation cavity and additional membrane formed between egg and adjacent cells. Meanwhile, nucleus changed from elliptical into crescent shape, with nuclear evagination dotted on the rim. Formation of additional membrane and separation cavity, changes in morphology and distribution of nucleus and organelle were all noted. Their functions in development and fertilization of egg were discussed.