| 泥螺精子发生的超微结构研究 |
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| 引用本文： | 应雪萍,姜乃澄,杨万喜.泥螺精子发生的超微结构研究[J].动物学研究,2002,23(5):T001-T003. |
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| 作者姓名： | 应雪萍 姜乃澄 杨万喜 |
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| 作者单位： | 1. 温州师范学院生物与环境科学系,浙江,温州,325027
2. 浙江大学生命科学学院,浙江,杭州,310012 |
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| 基金项目： | 浙江省自然科学基金资助项目 ( 3980 81)，温州师范学院科研项目 ( 2 0 0 1Y15 ) |
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| 摘 要： | 利用透岸民镜观察了泥螺精子发生的过程。结果表明；泥螺精子发生经历了一系列重要的形态和结构变化，主要有核逐渐延长，染色质浓缩，顶体形成，线粒体逐步发达与融合，胞质消除及鞭毛的形成等。泥螺精细胞分化可分为3个时期，在精细细胞分化过程中，细胞核形态及染色质的变化与其他软体动物有较大的差异，核内椭圆形到肾形，再变化为长圆柱形；染色质由絮状颗粒变为细纤维丝状，再变为长纤维丝状，最后向高电子密度均质状态转变，初步探讨了泥螺精子发生过程中核及细胞器的超微结构变化在分类上的意义。
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| 关 键 词： | 泥螺 精子发生 超微结构 |
| 文章编号： | 0254-5853(2002)05-0400-05 |
Ultrastructural Studies on Spermatogenesis of Bullacta exarata (Philippi) |
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| YING Xue-ping ,JIANG Nai-cheng ,YANG Wan-xi.Ultrastructural Studies on Spermatogenesis of Bullacta exarata (Philippi)[J].Zoological Research,2002,23(5):T001-T003. |
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| Authors: | YING Xue-ping JIANG Nai-cheng YANG Wan-xi |
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| Affiliation: | YING Xue-ping 1,JIANG Nai-cheng 2,YANG Wan-xi 2 |
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| Abstract: | The ultrastructure of spermatogenesis of Bullacta exarata was studied by using of transmission electron microscopy.The results show that there is a series of considerable changes in morphology and structure during the spermatogenesis.These changes include gradual nuclear elongation,chromatin condensation,formation of acrosome,development and fusion of mitochondria,cytoplasmic sloughing and flagellar formation.Acrosome is formed from proacrosomal vesicle fused with vesicles secreted by Golgi apparatus.Axoneme is formed from centriole.Spermatid differentiation can be divided into three stages.During the differentiation,the morphology and structure of nucleus and chromation are different from other Mollusks.The nucleus of early spermatid is oval-shaped and comprises heterogeneous aggregations of flocculent granular chromatin.In the middle stage,it is kidney shaped and its chromatin condenses to finely fibrils-shaped.As the spermatid matures,the nucleus elongates in the anterior-posterior axis,and the chromatin condenses to long fibrils and then condenses to high and even electron-density till the formation of spermatozoon nucleus.At the same time,the nucleus transforms from cylindric shape to long cylindric shape.Significance of nucleus and cell organelle as taxonomic character in the spermatogenesis of B.exarata is roughly discussed. |
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| Keywords: | Bullacta exarata Spermatogenesis Ultrastructure |
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