Transcriptional regulator essential for Nod-factor-induced gene expression (PubMed:15961668). Acts downstream of calcium spiking and DMI3, a calcium/calmodulin-dependent protein kinase (CCaMK) (PubMed:15961668). Transcription factor involved in the control of strigolactone biosynthesis in roots through the activation of the beta-carotene isomerase D27, which participates in a pathway leading to biosynthesis of strigolactones (PubMed:22039214, PubMed:26503135). Interacts with RAM1 (PubMed:26511916). Interacts with IPN2 and RAD1 (By similarity). Mainly localized to the nuclear envelope. Also found in the endoplasmic reticulum. Upon Nod-factor application, the nuclear envelope localization disappears and the protein accumulates in the nucleus. Expressed in roots, shoots and leaves. Induced 24 hours after treatment with Nod factor or Sinorhizobium meliloti. Belongs to the GRAS family.