夹竹桃科2种引种植物分泌结构的解剖学研究

Anatomy Studies on Secretory Structures in Two Species of Apocynaceae

摘要:

为了解夹竹桃科（Apocynaceae）植物乳汁管的发生发育，对爱之蔓（Ceropegia woodii）和百万心（Dischidia ruscifolia）营养器官中的分泌结构进行了显微观察。结果表明，爱之蔓和百万心营养器官中均有无节分枝乳汁管的分布，茎皮层中的乳汁管大部分具有明显的分枝，叶中乳汁管具明显分枝，分布与走向多与叶脉维管组织平行。另外，爱之蔓营养器官中的分泌结构除乳汁管外，还有分泌腔。这为夹竹桃科植物的系统分类研究提供了解剖学依据。

关键词:夹竹桃科;爱之蔓;百万心;乳汁管;营养器官;解剖学

Abstract:

In order to understand the origin and development of laticifers in Apocynacea species, the secretory structures in vegetative organs of Ceropegia woodii and Dischidia ruscifolia were observed under microscope. The results showed that there were branched laticifer without node in all vegetative organs of C. woodii and D. ruscifolia. Most of laticifers in stem cortex had distinct branches. The laticifer have distinct branches in leaf, and its distribution and orientation are parallel to vascular bundle of leaf vein. In addition, except for laticifer, there are secretory cavities in vegetative organs of C. woodii. So, these would provide an anatomical basis for the systematic classification of Apocynaceae.

Key words:Apocynaceae;Ceropegia woodii;Dischidia ruscifolia;Laticifer;Vegetative organ;Anatomy