安徽景天属(Sedum)植物叶表皮研究

A LEAF EPIDERMIS STUDY ON TWELEVE SPECIES OF SEDUM IN ANHUI

利用光学显微镜和扫描电子显微镜观察了安徽省１２ 种景天属（Ｓｅｄｕｍ） 植物的叶表皮，统计并测量了气孔类型、气孔大小、气孔密度及气孔指数等，描述了表皮角质膜、蜡质纹饰及气孔外拱盖的有关特征。结果表明：景天属植物叶表皮气孔器为不等细胞型。气孔器类型、表皮细胞形状及垂周壁式样、角质膜、蜡质纹饰等，种间无差异或极小，而气孔大小、气孔器分布特征、气孔密度、表皮毛等种间差异较大。建议在种间区分上将差异大的特征作为种间第一特征，将差异小的特征作为次级特征。

The leaf epidermis structures of 12 species, which belong to Sedum from Anhui province in China, have been examined under LM and SEM. The stomatal size, stomatal density and stomatal index were measured and counted under LM. Under SEM, it was discribed such as the shape of stomata, cuticular membrane, wax ornamentation, outer stomatal ledge (or rim) and trichome. The results show that the type of stomatal apparatuse in Sedum is the kind of tipical anisocytic type. The characters, such as the type of stomatal apparatuse, shape and pattern of anticlinal walls of epidermis cells, culticular membrane and wax ornamentation, are less important between species and can be used as secondary ones. The features of stomatal size, distribution, density and trichome possess the classific value of species.