PRELIMINARY-OBSERVATIONS ON THE FORMATION OF THE MALE GERM UNIT IN POLLEN TUBES OF CYPHOMANDRA-BETACEA SENDT
PRELIMINARY-OBSERVATIONS ON THE FORMATION OF THE MALE GERM UNIT IN POLLEN TUBES OF CYPHOMANDRA-BETACEA SENDT
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DOI：
10.1007/bf01403877
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发表时间：
1988-01-01
期刊：
影响因子：
2.9
通讯作者：
YU, HS
中科院分区：
文献类型：
--
作者：
HU, SY;YU, HS
甜菜花粉管中生殖细胞的结构及其与营养核的联系。用电子显微镜观察。生殖细胞由其自身的质膜和营养细胞的内质膜所包围，具有位于营养核内的细胞质伸展。生殖细胞含有正常的细胞器，特别是微管，这些微管沿着细胞的纵轴聚集在质膜附近的几组中。在半活体授粉后到达花柱下端的花粉管中，两个精子细胞都被拉长，多核糖体和微管是细胞质中的突出特征。两个精子由共同的横细胞壁连接，而胞质通道既存在于两个精子细胞的周质中，也存在于横壁中。前导精子细胞(SVN)与营养核密切相关。因此，本研究证实了甜菜花粉管中雄芽单位的存在。考虑了精子细胞之间以及配子和营养细胞之间可能的细胞质连续性。
The structure of the generative cell and its association with the vegetative nucleus in the pollen tube of Cyphomandra betacea Sendt. were observed with the electron microscope. The generative cell, bounded by its own plasma membrane and the inner plasma membrane of the vegetative cell, possesses the cytoplasmic extension which lies within the embayments of a vegetative nucleus. The generative cell contains the normal complement of organelles and, especially, microtubules which cluster into several groups adjacent to the plasma membrane, oriented along the longitudinal axis of the cell. In the pollen tube reaching the lower end of the style after semi-vivo pollination, both of the sperm cells are elongated and polyribosomes and microtubules are the outstanding feature in the cytoplasm. The two sperm cells are connected by a common transverse cell wall, while cytoplasmic channels exist in both the periplasm of the two sperm cells and the transverse wall. The leading sperm cell (Svn) is closely associated with the vegetative nucleus. Thus the present study demonstrates the existence of the male germ unit in the pollen tube of C. betacea. The possible cytoplasmic continuity between the sperm cells and between the gametes and vegetative cell is considered.