Mediates the transient calcium-dependent interaction of PYR/PYL/RCAR abscisic acid (ABA) receptors with the plasma membrane and thus regulates ABA sensitivity (By similarity). Stimulates the GTPase/ATPase activities of YchF1, and regulates its subcellular localization. Promotes tolerance towards salinity stress by limiting the accumulation of reactive oxygen species (ROS). Promotes resistance to bacterial pathogens (By similarity). Binds to PYR/PYL/RCAR abscisic acid intracellular receptors in an ABA-independent manner, both at the plasma membrane and in the nucleus. Binds phospholipids in a Ca(2+)-dependent manner (By similarity). Interacts with YchF1 (By similarity). Localized mainly in the cytosol under NaCl treatment, but translocates to the plasma membrane upon wounding. Belongs to the plant CAR protein family.