漆树乳汁道周围组织的亚显微结构及其与生漆产生关系的研究

STUDIES ON THE RELATION BETWEEN SYNTHESIS OF LACQUER AND SUBMICROSTRUCTURE OF THE TISSUE WHERE LATICIFEROUS CANAL LIES IN TOXICODENDRON VERNICIFLUM

漆树乳汁道周围组织的各个组成分子中都含有嗜锇物质。根据生漆的亲脂性质分析,这些嗜锇物质很可能就是生漆的前体物质。电子显微镜的观察结果表明,在漆树乳汁道周围组织的各个组成分子中,这些前体物质主要是在内质网槽库上合成,通过内质网小泡、高尔基体小泡以及质膜凹陷包被等方式转运到质膜外空间,再以扩散渗透方式通过细胞壁向乳汁道分泌细胞转移:经过胞间连丝的共质体途径也存在于这个运输过程中。

Various compositional elements of the tissue where laticiferous canal lies in T. verniciflum contain osmiophilic droplets. According to the lipophilic property of lacquer, these osmiophilic substances may be lacquer or its precursors. Electron microscope photographs suggest that lacquer is synthesized in ER cirsternae in T. verniciflum, and that they may be eliminated from protoplast to the space between the plasmalemma and the wall in two ways: (1) by the vesicles from ER and Golgi body approaching the plasmalemma and fusing their membranes with the latter; (2) by their becoming surrounded by plasmalemma invaginations, and then they are transited to secretory cells of the laticiferous canals by the channels of plasmodesmata and percolation through the wall.