麻疯树乳汁管的解剖学研究

Anatomy of Laticifers in Jatropha curcas L.

麻疯树(JatrophacurcasL.)的乳汁管能分泌含有多种药用成分的乳汁。采用石蜡切片、冰冻切片和半薄切片技术,在光学显微镜下观察麻疯树乳汁管的类型、分布和大小。结果表明,麻疯树中存在有节连接和非连接乳汁管、无节分枝和不分枝乳汁管;乳汁管普遍分布在皮层和韧皮部,茎和叶脉的木质部存在少量的乳汁管,茎、叶柄、花梗和果柄的髓部有少量分布;靠近维管组织的皮层中的乳汁管直径较大,而靠近表皮的皮层中的乳汁管直径较小,如茎中靠近维管组织的乳汁管直径为40-60μm,而靠近表皮的乳汁管直径为5-18μm。

Laticifers of Jatropha curcas L. （Euphorbiaceae） are cells which secret latices with medicinal components. The types, distribution and sizes of laticifers in all organs of this species were observed under light-microscope by the means of paraffin sectioning, freeze-sectioning and semi-thin sectioning. The results showed that there were four types of laticifers in Jatropha curcas, i.e. articulated anastomosing and nonanastomosing laticifers, non-articulated branched and unbranched laticifers. The laticifers were commonly distributed in the cortex and phloem, whereas a few laticifers in xylem of stem and vein, as well as in pith of stem, petiole, pedicel and fruit stalk. The diameters in laticifers near vascular tissues were wider than those near the epidermis. In stem, the diameters of laticifers near vascular tissues and near epidermis were 40-60 μm and 5-18 μm, respectively.