Involved in the regulation of indeterminate nodule identity in association with NOOT1. Induced in roots during early nodule formation. No visible phenotype under normal growth conditions (PubMed:30026291). 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).