Transcriptional activator activated by proteolytic cleavage through regulated intramembrane proteolysis (RIP) (PubMed:18443413, PubMed:24329768). Calmodulin-regulated transcriptional repressor. Binds several synthetic promoters with randomly selected binding sites (PubMed:17947243). Functions synergistically with SNI1 as negative regulator of pathogen-induced PR1 expression and basal resistance to a virulent strain of P.syringae. Binds directly to the promoter of the PR1 gene (PubMed:22826500). Acts as positive regulator of innate immunity. Involved in the effector-triggered immunity (ETI) induction of immunity-related gene expression (PubMed:24329768). Mediates osmotic stress signaling in leaf senescence by up-regulating senescence-associated genes (PubMed:18443413). Interacts with calmodulin (CaM) (PubMed:17947243). Interacts with SNI1 (PubMed:22826500). Localized primarily in plasma membrane or endoplasmic reticulum membrane as dormant form and, upon osmotic stress or pathogen attack, is processed into a transcriptionally active and nuclear form after a proteolytic cleavage through regulated intramembrane proteolysis (RIP). A number of isoforms are produced. According to EST sequences. Expressed in roots, rosette leaves, cauline leaves, shoot apex, stems and flowers (PubMed:17158162). Expressed in guard cells (PubMed:18443413). Induced during normal senescence. The NAC domain includes a DNA binding domain and a dimerization domain. No visible phenotype under normal growth conditions (PubMed:18443413, PubMed:22826500). Mutant plants display enhanced resistance to the bacterial pathogen P.syringae pv. tomato DC3000 (PubMed:22826500).