ISSR identification of genetic diversity of Rehmannia glutinosa in Huai zone Textual research on planting history of Rehmannia glutinosa and its cultivated varieties Effects of various treatments and influencing factors on catalpol in Rehmannia glutinosa Optimization of ISSR-PCR amplification in Huai Rehmannia glutinosa Quantitative characters of flower and fruit and their significance in identifiention of germplasm of Rehmannia glutinosa Gene cloning, features of sequence, and analysis on temporal and spatial expression of Rehmannia glutinosa f. hueichingensis 3-ketoacyl CoA-thiolase Determination of catalpol and aucubin in fresh Rehmannia glutinosa by HPLC