Together with ABCG25, export abscisic acid (ABA) from the endosperm to deliver it to the embryo via ABCG30 and ABCG40-mediated import to suppress radicle extension and subsequent embryonic growth (PubMed:26334616). Together with ABCG9, involved in pollen coat deposition of steryl glycosides required for pollen fitness (PubMed:24474628). May be a general defense protein (By similarity). abscisate(in) + ATP + H2O = abscisate(out) + ADP + H(+) + phosphate Expressed in seedlings, stems, leaves, siliques and inflorescence (PubMed:12430018, PubMed:24474628). In seeds, confined to the endosperm (PubMed:26334616). Highly expressed in the tapetum of anthers (PubMed:24474628). Expressed transiently during flower develoment in the anthers and developing siliques (specifically in the maternal tissues), mostly in the pollen and the tapetal cell layer during pollen maturation. Induced by cycloheximide (CHX). Early seeds germination on imbibition without stratification, and reduced abscisic acid (ABA)-mediated inhibition of stratified seeds germination (PubMed:26334616). Pollen grains of the double mutant abcg9 abcg31 shrivel up and collapse upon exposure to dry air, and exhibit an immature coat containing reduced levels of steryl glycosides, thus leading to a low viability (PubMed:24474628). Belongs to the ABC transporter superfamily. ABCG family. PDR (TC 3.A.1.205) subfamily.