漆树乳汁道分泌细胞的超微结构及其与生漆产生和分泌关系的研究

漆树(Rhus verniciflua)乳汁道分泌细胞含有丰富的质体、内质网和嗜锇物质。电子显微镜的现察结果表明,嗜锇的生漆成分合成的可能场所是质体和内质网,并且通过内质网分子和小泡群与质膜相互接触并融合以及质膜内褶包被等三种形式释放到质膜和细胞壁之间的间隙中;再经过细胞壁中乳汁道腔形成时断裂了的胞间连丝通道和扩散渗透两条途径,越过细胞壁分泌到乳汁道腔中。细胞核、线粒体、高尔基体以及细胞质基质或多或少也参与了上述过程。

STUDIES ON THE RELATION BETWEEN THE ULTRASTRUCTURE OF SECRETORY CELLS AND THEIR SYNTHESIS AND SECRETION OF LACQUER IN LATICIFEROUS CANALS OF RHUS VERNICIFLUA

Secretory cells of laticiferous canals contain many plastids and endoplasmic reticulum (ER)in Rhus verniciflua.The electron microscopy suggests that esmiophilic lacquer compon- ent is mainly synthesized in the plastids and ER.They may be eliminated from the protoplasts to the space between the plasmalemma and the cell wall in three ways:(1)by ER elements, (2)by vesicles approaching the plasmalemma and fusing their membrances with the latter,and (3)by their becoming surrounded by plasmalemma invaginations,and then they traverse the wall through the channels of plasmodesmata which became disconnected during the schizogenous development of the canals and percolate through the wall that faded into an even looser mesh of fibrillar material toward the canal lumen.More or less,nucleus,mitochondria,Golgi bodies and ground cytoplasm also take part in the above-mentioned process.