四种补血草属植物叶片泌盐结构的扫描电镜观察

利用扫描电镜技术，对4种补血草属植物大叶补血草（Limonium gmelinii (Willd.) Kuntze）、耳叶补血草（Limoniu otolepis (Schrenk) Kuntze）、繁枝补血草（Limonium myrianthum (Schrenk) Kuntze）和簇枝补血草（Limonium auream）的叶表面进行了研究，以探讨植物微形态结构与生态环境的关系。结果表明，这4种植物的上下表皮都分布有盐腺，且上表皮的盐腺密度大于下表皮，盐腺的基本结构相同，多由20个细胞构成，其中4个分泌细胞顶端的角质层中央有一小孔，植物体靠盐腺的泌盐孔泌盐。但4种植物在盐腺的密度、盐腺的大小、盐腺与周围表皮细胞的位置等方面存在差异。植物在对盐碱生境的长期适应过程中，促使其强烈地分化出泌盐结构，因而，具有明显的生态适应性。

A SEM observation of the salt-secreting structure of leaves in four species of Limonium

The surface of leaves was studied by SEM in the following four Limonium species: Limonium gmelinii(Willd.) Kuntze,Limonium otolepis(Schrenk) Kuntze,Limonium myrianthum(Schrenk) Kuntze and Limonium auream,Inorder to research the relationships between the micro-structure of plants and environment.The result shows that each of these four plants has a distributing of salt gland in their upper and lower epidermis of leaf,Most of them are consisted of 20 cells,and 4 out of 20 respectively has a small hole on the center of cuticle.The salt release of plant relies on the salt-secreting holes of salt gland.However,each of the four species has a difference in the density,the size and the position of the salt gland.During the long-time adaptation to the special habitat of saline-alkali,and this enables a plant to differentiate strongly into salt-secreting structure,Therefore,it is obvious significance in ecological adaptation.