6种萆薢类药材导管内壁的扫描电镜观察

目的：用扫描电镜研究６种萆薢类药材绵萆薢，粉萆薢，福萆薢，白萆薢，山萆薢和盾叶萆薢导管内壁的超微特征并鉴别之。方法：把显微纵向切片粘贴于样品台上并喷镀金属膜，用扫描电镜进行观察并摄影。结果：上述６种药材导管内壁的超微特征如导管内壁的光滑程度，间隔带的有无，纹孔的密度，排列方式，形状和大小等在扫描电镜下清晰可见，并且每种药材的超微特征都存在差异。结论：根据导管内壁超微特征，上述６种药材能被鉴别；扫描电镜能用于根茎类药材内部超微特征的研究，这为扫描电镜鉴别药材开拓了新的领域。

Observation on Trachea Inner Walls of Six Species of Sect.Stenophora by SEM

Objective:To probe and identify the ultramicro characteristics of trachea inner walls(TIW)of six species of Sect.Stenophora,i.e.,Rhizoma Dioscoreae Spongiosae,Rhizoma Dioscoreae Hypoglaucae,Rhizoma Dioscoreae Futschauensis,Rhizoma Dioscoreae Gracillimae,Rhizoma Dioscoreae Tokoro and Rhizoma Dioscoreae Zingiberensis,by scanning electron microscope (SEM).Method:The vertical microscopical sections are stuck on the platform of species and metal plated.TIW were observed and photographed by SEM.Result:The ultramicro characteristics of TIW,i.e.,the smoothnesss of TIW,the existence of separation bands,the density,arrangement types,shapes and sizes of pits,etc., can be seen clearly under SEM.Further,there exist differences in the ultramicro characteristics of each species.Conclusion:The above six species of crude drugs can be identified according to their ultramicro characteristics of TIW.SEM can be used to study the ultramicro characteristics of crude drug rhizomas thus creating a new area for identifying crude drugs.