Essential for breaking seed dormancy before seed germination (PubMed:26583028). Prevents reactive oxygen species (ROS) accumulation in response to abscisic acid (ABA) and oxidative stress, probably by repressing the accumulation of ABA-induced ROS-scavenging enzymes (e.g. CSD3) (PubMed:26583028). Translocates from the nucleus to the cytoplasm in response to abscisic acid (ABA) and oxidative stress (e.g. hydrogen peroxide H(2)O(2) and methyl viologen (MV)). Mostly expressed in siliques and, to a lower extent, in roots (PubMed:26583028). Barely deteclable in leaves and stems (PubMed:26583028). Slightly induced by abscisic acid (ABA). Hypersensitivity to abscisic acid (ABA) during seed germination and to methyl viologen (MV) at the seedling stage, associated with a reduced expression of the superoxide dismutase CSD3 and an enhanced accumulation of reactive oxygen species (ROS) after ABA treatment.