Involved in the promotion of leaf and floral meristem fate and determinacy (PubMed:23136374). Promotes normal stipule growth and development (PubMed:23136374). Involved in the coordination of the symbiotic nodule developmental program (PubMed:23136374). Necessary for the robust maintenance of nodule identity throughout the nodule developmental program (PubMed:23136374). Involved in the regulation of indeterminate nodule identity in association with NOOT2 (PubMed:30026291). Expressed in the shoot apical meristem (SAM) at the base of the developing leaf where stipules are formed. Induced in roots during nodulation. Altered morphology of stipules and flowers (PubMed:23136374). Partial loss of nodule identity characterized by the development of ectopic roots arising from nodule vascular meristems (PubMed:23136374). The double mutants noot1 and noot2 exhibit complete loss of nodule identity and develop only non-fixing root-like structures that are no longer able to host symbiotic rhizobia (PubMed:30026291).