摘要
胞间连丝是植物细胞间物质运输和信息传递的直接通道,对植物的生长与发育,以及植物对环境的反应与适应等诸多方面起着十分重要的作用,是当今细胞生物学中最活跃的研究领域之一。本研究揭示,在小麦幼叶组织细胞壁中存在着胞间连丝的多样性,其中至少有4种类型:(1)具有压缩内质网(ER,中央桥管)的直形通道的胞间连丝;(2)"颈型"胞间连丝,即包含ER的胞间连丝的两端发生收缩,显示一种"颈"现象,甚至在中段形成一种"腹部"现象;(3)分枝型的胞间连丝,包含压缩ER;(4)令人感兴趣的是观察到一种不具中央桥管(不含ER),仅为质膜包围的简单的胞间连丝。这一观察证实,包含ER的胞间连丝不是高等植物的唯一结构类型。这种不具ER的简单胞间连丝对于大分子物质的运输,特别是原生质、染色质及细胞核的胞间迁移,可能是一种更有效的通道。
Electron microscopic observations revealed that there were at least 4 types of plasmodesmata existed in the cell walls of wheat young leaf tissues:(1) Straight channel of plasmodesmata with an appressed endoplasmic reticulum (ER, central desmotubule);(2) “neck type” plasmodesmata, e.g. both ends of the ER-contained plasmodesma appeared to be constricted, showing a “neck region”, and even forming an “abdomen” phenomenon; (3) branched plasmodesmata with appressed ER;(4) Lastly and most interestingly, a simple plasmodesma, that only is a plasmalemma-lined channel, without ER was found, which demonstrates that the ER-contained plasmodesma is not the unique characteristic in higher plant. The plasmodesma without ER might be a more effective pathway for macromolecules intercellular transport, particularly, for the intercellular movement of protoplasm, chromatin and nucleus.
出处
《电子显微学报》
CAS
CSCD
2005年第2期151-156,共6页
Journal of Chinese Electron Microscopy Society
基金
NationalNaturalScienceFoundationofChina(No.60050003).
