The paper begins with a review of the concept of neoplastic progressions in plant tissue cultures, with the progressive acquisition of (a relative) independence to thehormones auxins and cytokinins. It takes advantage of the deviations of carbon and nitrogen metabolisms shown in these particular cases, to illustrate the interdependencewith the metabolisms of the hormones ( and increased sensitivities to) polyamines and ethylene. These results provide additional examples of the changing concepts inhormonology.