Symbiotic legume nodules are classified as determinate or indeterminate depending on the persistence of
nodule meristem. This review compares and contrasts the roles of different plant hormones during the development
of these two types of nodules. Cytokinins promote the formation of both types of nodules while ethylene and abscisic
acid inhibit them. Interestingly auxin, jasmonic acid, gibberellic acid and brassinolides appear to distinctly influence
the two types of nodules.