Transcription factor involved in the regulation of gene (e.g. drought-regulated and flavonoid biosynthetic genes) expression and stomatal movements leading to negative regulation of responses to drought and responses to other physiological stimuli (e.g. light) (PubMed:16005291, PubMed:21637967). Promotes guard cell deflation in response to water deficit. Triggers root growth upon osmotic stress (e.g. mannitol containing medium) (PubMed:21637967). Specifically expressed in guard cells (PubMed:16005291, PubMed:18036199, PubMed:22088138, PubMed:23828545). Present in seedlings, leaves, stems and flowers (PubMed:16005291, PubMed:22088138). Induced by jasmonic acid (JA) and salicylic acid (SA) (PubMed:16463103). Triggered by auxin (IAA) in roots (PubMed:9839469, PubMed:21637967). Stimulated by light, UV-light and cold (PubMed:9839469). According to PubMed:16005291 and PubMed:23828545, rapidly repressed by abscisic acid (ABA) in an ABI1-dependent manner. But in contrast, according to PubMed:21637967, transiently induced by ABA in seedlings (PubMed:16005291, PubMed:21637967, PubMed:23828545). Rapidly repressed by drought. Activated by white light, but repressed by blue light and darkness (PubMed:16005291). Transiently induced by salt (NaCl) in seedlings. Induced by sucrose (PubMed:21637967). Positively regulated by SCAP1 (PubMed:23453954). Constitutive reduction of stomatal opening and decreased wilting under water stress conditions resulting in abnormally turgid and green leaves as well as an enhanced tolerance to drought, and associated with an altered expression of some genes (e.g. ERD10, ERD13, NHL3, SYP122, VPEgamma, ERF and ZAT genes) mainly involved in response to stress. Normal stomatal closure in the dark and upon abscisic acid (ABA) exposure. Mediates the inhibition of anthocyanin (e.g. cyanidin and delphinidin) biosynthesis when expressed in lettuce L.sativa and could thus be used for the development of new varieties of lettuce. Promoter triggering guard cells-specific expression can be used in tobacco (N.tabacum) and tomato (S.lycopersicum) to monitor stomata genetic engineering.