关键词: 六盘山鸡爪大黄, 茎和叶, 大黄多糖, 分布规律

Abstract: The storage and distribution laws of rhubarb polysaccharide in the stems and leaves of Rheum tanguticum Maxim.et Balf. var. liupanshanense Cheng et kao were studied by histochemical methods．The results showed that the distribution of rhubarb polysaccharide in stems and leaves was diverse．Rhubarb polysaccharide of the stems existed in the cortex，xylem parenchyma，phloem parenchyma of vascular bundle，pith ray and pith．With the gradual maturity of the stems，the content of rhubarb polysaccharide increased to certain degree.The epidermis，mesophyll tissue and vein of leaves accumulated a small amount of rhubarb polysaccharide.The ground tissue outside the bundle of petiole accumulated a small amount of rhubarb polysaccharide.In general，the distribution of rhubarb polysaccharide in stems and leaves was deficient.

Key words: Rheum tanguticum Maxim.et Balf.var.liupanshanense Cheng et kao, stems, leaves, rhubarb polysaccharide, distribution laws