ABSTRACT
Object In order to choose high hypericin content variety and its useful part, the study on the correlation between nodule density of different organs and hypericin content in Hypericum perforatum L was carried out Methods The nodule density of leaf, calyx and petal were observed under a Leica DMLB microscope; the hypericin contents of different organs were determined by HPLC Results Hypericin and its derivatives were not obtained from the root, fruit and leaf central part of H perforatum The hypericin contents of leaf margin, calyx, petal were 0 145 6%, 0 065 3%, 1 268 2%, respectively Conclusion The organs and parts with nodules contain hypericin and its derivatives There is positive correlation between the hypericin content and nodule density, but the other organs or parts without nodules don't contain such materials