满江红叶片形态特征的环境扫描电子显微镜活体观察

Form feature of the leaf of Azolla imbricata(Roxb.) Nakai observed lively by environmental scanning electronic microscope

为了克服水生植物含水量高,形貌容易变化的问题,本文利用环境扫描电子显微镜对水生蕨类植物满江红(Azolla imbricata)的形态结构进行了活体观察。满江红枝条顶端的叶片交互式覆瓦状排列,叶片圆形,几乎无气孔。位于茎中部和下部的叶片,2列互生,叶片对折抱茎,具有气孔。满江红叶片边缘具分泌细胞,幼叶的分泌细胞外具许多方形的盐结晶体,老叶的盐结晶体则脱落。结果发现,满江红具有向体外泌盐的功能。

In order to surmount higher consist of water and the changeable morphology of aquatic plants, this article describes the use of environmental scanning electronic microscope （ESEM） to observe the morphological structure of aquatic fern Azolla imbricata alive. Azolla branches are covered by the tile-shaped leaves that are interactive, round almost no porosity in the top. The leaves located in the middle and lower stem, two alternate, leaf fold with a stoma. The secretory cells were found along the edges of new leaves to a large amount of square salt crystals. The salt crystals fall off when the leaves turned old. The results showed that A. imbricata has the function to secrete salts from the outer leaves.