By using the techniques of light microscope,scanning electron microscope,transmission electron microscope and histochemical localization of dioscin,the cytoarchitecture feature and dioscin distribution of the protocorm-like body（PLB）of Dioscorea zingiberensis C.H.Wright were studied.The results showed the PLB,a compact corm wrapped by scale leaves,consisted of periderm and vascular bundle scattered among the ground tissue,PLB enlargement largely due to the cell division of the primary thicking meristem（PTM）and procambium.Furthermore,callus ...
