Transcriptional regulator required for Nod-factor-induced gene expression (PubMed:24400899). Transcription activator involved in the induction of NIN and ENOD40 genes, which are required for rhizobial infection and early nodule development (PubMed:24400899). Possesses strong transactivation activity in vitro (PubMed:24400899). Does not seem to contribute to the early steps of the arbuscular mycorrhizal fungus infection and colonization processes in roots (PubMed:24400899). Interacts with NSP2. Expressed in leaves, stems, nodules and roots. Induced in roots after inoculation with Mesorhizobium loti. Roots of plants silencing IPN2 exhibit decreased rhizobial infection and nodule organogenesis under nitrogen limitation when inoculated with Mesorhizobium loti. Belongs to the MYB-CC family.