Involved in the oxidative degradation of abscisic acid, but not in the isomerization of the produced 8'-hydroxyabscisic acid (8'-OH-ABA) to (-)-phaseic acid (PA). Involved in the control of postgermination growth. 2-cis-(+)-abscisate + O2 + reduced [NADPH--hemoprotein reductase] = (+)-8'-hydroxyabscisate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Inhibited by tetcyclcis, but not by metyrapone. Plant hormone degradation; abscisic acid degradation. Mainly expressed in flower buds, flowers, rosette leaves and roots. Lower expression in mature siliques and inflorescence stems. Not expressed in dry seeds. Up-regulated 12 hours after imbibition. By abscisic acid, brassinosteroid or gibberellin treatments, by salt or osmotic stresses, and by dehydration and rehydration. Expression regulated by phytochrome B. Plants are not affected in seed germination, but show a restricted greening rate after germination and increase the drought resistance. May be due to an intron retention. Belongs to the cytochrome P450 family.