Probable inactive ADP-ribosyltransferase that functions with RCD1 to regulate oxidative stress, hormonal and developmental responses. May regulate some stress-responsive genes. Seems to play a smaller developmental role than R. Interacts with DREB2A, DREB2B, DREB2C and NAC082. Speckle-like pattern. Expressed in young developing tissues, such as young leaves and flowers and root tips. In mature plants, expressed in vasculature of leaves and roots. Expressed in the embryo proper at the globular stage. Expressed in the embryo until the torpedo stage, after which expression within the procambial strands becomes pronounced. By salt stress. No visible phenotype under normal growth condition. Lacks the conserved catalytic triad His-Tyr-Glu of the active site.