Transcription activator that may act as growth regulators in response to water deficit. Interacts with the core sequence 5'-CAATTATTA-3' of promoters in response to ABA and in an ABI1-dependent manner. Involved in the negative regulation of the ABA signaling pathway. Interacts with ABI1. Widely expressed. By water deficit, by abscisic acid (ABA) and by salt stress. Self expression regulation. Phosphorylated by PKA. Reversible inactivation of the binding to DNA by phosphorylation. Belongs to the HD-ZIP homeobox family. Class I subfamily. It is uncertain whether Met-1 or Met-2 is the initiator.