【摘要】 对甘薯雌蕊引导组织细胞的超微结构进行了观察分析.结果表明,甘薯引导组织细胞具有典型的分泌型传递细胞的特征.具体表现在以下几方面:1.细胞质基质中富含各种细胞器,特别是线粒体、内质网和核糖体更丰富,表明细胞在合成、运输和能量代谢上是活跃的.2.细胞核大,并常有瓣裂,核膜孔多而显著,染色质分散,表现出高度活跃的功能状态.3.细胞壁向内生长,形成一些非常大的壁内突.质膜紧密地沿内突分布,形成在功能上的复合结构——壁-质膜器.4.细胞间隙含有大量的电子致密的颗粒状或小泡状分泌物质.本文还就引导组织细胞壁的分层与胞间物质的化学组成及其功能等进行了讨论.更多还原

【Abstract】 The ultrastructure of transmitting tissue in the pistil of sweet, potato (Ipomeoa batatas) has been observed. According to the specialized characteristics the cells of the transmitting tissue, is evidently a typical transfer cell of the secretory type. The ultrastructural specialization of the cells of the transmitting tissue may be characterized as follows:1. There are numerouscell apparatus in the cytoplasm, apparently mitochondria, endoplasmic reticulum and ribosomes are more rich . It indicates that this cell is active in synthesis, intercellular transport and energy metabolism.2 Nuclei are large and a high degree of lobing. Nuclear pores are numerous and obvious. Peasely staising chromatin material is scattered throughout. There are indications that it is a high active functional state.3 Cell wall ingrown extending into the cytoplasm forms large wailingrowth. The plasmalemma closely follows the contours of the ingro ingrowths to from the wall-membrane apparatus.4 There are numerous electron-dense granular and vesicular secretion in the extracellular matrix.The dividing layer of the cell wall in the transmitting tissue and the chemical composition and the function of the intercellular substance have been discussed in this paper.更多还原