Accumulation and Distribution Characteristics of Rhubarb Polysaccharides in Root of Rheum palmatum L. Pharmacokinetic study of Rheum palmatum in vivo in rats Effects of different carbon sources on biomass accumulation and anthraquinone yield of hairy root cultures ofRheum palmatum ABNORMALITY AND DEVELOPMENT OF ANTHER IN RHEUM PALMATUM L Embryological Studies in Rheum palmatum L. Effect of various media on quality of hairy root clones of Rheum palmatum