May be involved in defense responses monitoring (PubMed:21798943). Probably implicated into osmotic stress signaling (PubMed:23517122). By stressful environmental conditions such as salt stress, AgNO(3), and sulfur deficiency (PubMed:15842617, PubMed:25628631). Induced during oxidative stress (PubMed:25628631). Accumulates at the beginning of an extended night, which may indicate that it is induced by carbon starvation and in response to sugar (PubMed:25628631). Induced by a combination of light and plastid signaling (PubMed:22383539). Enhanced tolerance to osmotic stress (PubMed:23517122). Increased susceptibility to pathogens such as P.syringae and H.arabidopsidis (PubMed:21798943).