半边莲营养器官结构与生态环境的关系

利用石蜡切片和光学显微镜,对半边莲的营养器官进行形态解剖学研究。结果表明:半边莲根和茎的次生结构不发达;地上茎表现为根的特征:茎皮层所占比例较大,茎中有明显的内皮层,内皮层上具凯氏带;根的皮层和茎的髓具通气组织,裂生型分泌道存在于茎的皮层;叶的气孔高于表皮,气孔只在上表皮有分布,叶尖具水孔。半边莲的形态结构特征表现出对水生生活的高度适应。对半边莲的系统位置也作了简单探讨。

Relation between vegetative organ structure and ecotope of Lobelia chinensis

The vegetative organs of Lobelia chinensis was studied by the method of paraffin slice and light microscope.The results showed that L.chinensis had some morphological characteristics as follows:firstly,the secondary structure of stem and root of L.chinensis was underdeveloped.Secondly,the stem showed some characteristics which belong to root,such as,cortex took lager room of stem.Also,there were obvious casparian strip in endodermis.Thirdly,There were a great deal of ventilating tissue in root’s cortex and stem’s medulla,and there were schizogenous secretory cavity in cortex of stem.Moreover,there were some special characteristics of leaf,for example,stomas stood out of the epidermis and scattered on upper epidermis only.Besides,water pores distributed in the top of leaves.All the results confirmed the morphological and anatomical structure characteristics of L.chinensis showed a hige degree of adaption to aquatic surroundings.Finally,the systematic position about L.chinensis was discussed simply in this paper.