Eriksson medium was developed for cell suspension cultures of Haplopappus gracilis.
An increase in the growth of cell suspensions, especially with small inocula, was achieved by a 10% reduction of the concentration MS microelements, except for Fe and Zn. Equim-olar replacement of ZnSO4.-7H2O by ZnNa2EDTA improved cell growth as well. MnEDTA and CoEDTA did not improve the growth of the cell culture. A reduction of Murashige and Skoog NH4NO3 concentrati-on of 1650 to 1200 mg/l and an increase in phosphate to 2.5 mM also stimulated cell growth.