Involved in the oxidative degradation of abscisic acid. Plays an important role in determining abscisic acid levels in dry seeds and in the control of postgermination growth. 2-cis-(+)-abscisate + O2 + reduced [NADPH--hemoprotein reductase] = (+)-8'-hydroxyabscisate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Plant hormone degradation; abscisic acid degradation. A number of isoforms are produced. According to EST sequences. Mainly expressed in flowers, siliques, roots and stems. Lower expression in rosette leaves and dry seeds. Expressed in vascular tissues of embryo during the seed development. Expressed predominantly during mid-maturation of seed and down-regulated during late maturation. Up-regulated 12 hours after seed imbibition. By abscisic acid treatment, salt or osmotic stresses, and by dehydration and rehydration. Expression regulated by phytochrome B. Plants show a reduced germination. Belongs to the cytochrome P450 family.