In cultivated Salvia miltiorrhiza roots, light-colored periderm contained less layers of cells and low ratio of phloem t栽培丹参根的周皮细胞层数少、色淡，韧皮部与木质部比值小，而野生丹参根的周皮细胞层数多、颜色重，韧皮部与木质部比值大。