Technique on artificial seeds of Pinellia ternata Effects of potassium salts on direct induction of microtubers in Pinellia ternata Effects of different factors on direct induction of microtubers from explants in Pinellia ternate Storage technique on artificial seeds of Pinellia ternata Research on Direct Formation of Microtubers from Pinellia ternata Establishment and optimization of sliver staining differential display of microtubers from Pinellia ternata in vitro Efficient method for extraction of high quality RNA from microtubers of Pinellia ternata in vitro Effects of CaCl2 concentrations on the yield,  quality and physiological disorder of potato microtubers