甘草属植物叶表皮特征及其系统学意义

应用叶片离析法和石蜡切片法,在光学显微镜下观察了国产甘草属植物10种1变种共16个代表植物的叶表皮特征。统计并测量叶表皮气孔大小、气孔密度及气孔指数。结果表明,该属植物叶表皮细胞形态(表面观)为多边形和不规则形,垂周壁式样为平直、浅波缘、深波缘;气孔器有6种类型,以无规则型、不等型、短平列型为主,一种植物往往具有2~3种气孔器;毛状体为单毛和鳞片毛两种类型。以上特征在属以下、种以上的分类等级具有一定规律性,有的也表现出种间差异,对甘草属属以下等级的划分有重要价值,同时也为本属一些分类群间的系统关系的探讨提供佐证。

Characters of Leaf Epidermis and Their Systematic Significance in Glycyrrhiza

The leaf epidermal characters of 10 species,1 variety (16 samples) in different series of the genus Glycyrrhiza are observed with the light microscope under the conditions of epidermal maceration and paraffin section.The stomatal size,density and index were measured and counted.The results show that the shape of leaf epidermal cells are polygonal or irregular,and the anticlinal walls are straight,sinuate or sinuolate.The stomatal apparatuses can be divided into 6 types,most of them are anomocytic,anisocytic and brach paracytic,only one species usually has two to three types of stomatal apparatuses.Trichomes can be divided into two groups,simple trichomes and scales.These characters have some regularity in subdivision of the genus and supraspecific taxon,some differences were also found among species.Therefore these characters are much of signification in identification to subdivision of the genus,and also provide evidence for studies on systematic relationships of several taxons in genus.