Transcription factor involved in symbiotic nodule signaling in response to rhizobial Nod factors (NFs). Binds to the GCC box (NF-responsive box) of ENOD11 promoter. Acts as transcriptional activator of NF-responsive box-containing target gene promoters in root hairs (PubMed:17827349). Involved in early stages of root nodule development. Functions redundantly with ERN1. Is essential with ERN1 for the initiation of root hair infection, and nodule organogenesis and development. Required for accurate expression of the NF signaling genes ENOD11 and ENOD12 (PubMed:23077241, PubMed:27208242). Expressed in roots, root hairs and leaves (PubMed:17827349). Expressed in root epidermis and root hairs (PubMed:23077241). Induced by Nod factors in root hairs. Belongs to the AP2/ERF transcription factor family. ERF subfamily.