Cardenolides of Digitalis obscura: the effect of phosphate and manganese on growth and productivity of shoot-tip cultures

anion aniones anions carotenoide carotenoides carotenoids chemical composition chlorophylle chlorophylls clorofilas composition chimique crecimiento croissance cultivo in vitro culture in vitro culture media culture techniques digitalis drug plants feuille fosfatos glicosidos glycoside glycosides growth hojas in vitro culture lactonas lactone lactones leaves medio de cultivo metabolites metabolitos milieu de culture phosphate phosphates pigment pigmentos pigments plantas medicinales plante medicinale production productividad productivity scrophulariaceae stems tallo technique de culture tige