HPLC method for simultaneous quantitative determination of six active ingredients in Rhodiola crenulata from different origins of Qinghai-Tibet Plateau Effects of Endophytic Fungi ZPRa-R-1 on the Key Singnal Molecules and the Main Secondary Metabolites in Rhodiola crenulata Optimization of regeneration system and resistance screening of Rhodiola crenulata Genomic DNA cloning and analysis of uridine diphosphate-glucosyltransferase gene from Rhodiola crenulata RAPD analysis of common medicinal plants of Rhodiola L. in Yunnan Province Flavonoids from roots and rhizomes of Rhodiola crenulata