Required for the cuticle, root suberin and pollen coat development by controlling cutin and maybe wax transport to the extracellular matrix (PubMed:24112720, PubMed:20035035). Involved in developmental plasticity and stress responses. Together with ABCG9 and ABCG14, required for vascular development by regulating lipid/sterol homeostasis (PubMed:24112720). May be a transporter of lignin precursors during tracheary element differentiation (PubMed:28921082). Homodimer (PubMed:24112720, PubMed:20870961). Forms heterodimers with ABCG9, ABCG12 and ABCG14 in epidermal cells (PubMed:24112720, PubMed:20870961). Localized in a polar manner in the epidermis side facing the extracellular matrix (cuticle) and in the endosperm tissue of the developing seed (PubMed:20035035). Trafficking to the plasma membrane is independent of ABCG12 (PubMed:20870961). Expressed in seedlings, roots, stems, leaves, flowers, and siliques, mostly in epidermis, trichomes, vasculatures and developing tissues (PubMed:14730060, PubMed:17727615, PubMed:17951461, PubMed:17989085, PubMed:24112720, PubMed:20035035). Follows an uniparental maternal expression in the seed, thus being the product of a maternally expressed imprinted gene (PubMed:21838868). Accumulates in the phloem (PubMed:24112720). Transcripts seem to be transported from shoots to roots (PubMed:27247031). First observed in seed coat and the endosperm (PubMed:20035035). Displays a polar localization in the embryo protoderm (PubMed:20035035). During embryo development, expressed in the radical tip. In seedlings, localized in the cotyledons, root tip, and young leaves. As secondary root tips emerge, expressed in the pericycle during the initial cell divisions. In leaves, mostly detected in the expanding basal portion, trichomes and stomatal cells. Present in rosette leaves vascular system and epidermis (PubMed:24112720). In roots of mature plants, mainly expressed in lateral root primordia and developing lateral roots (PubMed:24112720). Accumulates in buds and open flowers, mainly in the petal epidermis and the vasculature (PubMed:20035035). In the inflorescence, found in all floral organs, predominantly in the anthers, styles, and young siliques, particularly in young seeds (PubMed:20035035). Upon anthesis and later, progressively restricted to the carpel. Also observed in phloem cells of the flower stem, and in the cortical cells and interfascicular fibers (PubMed:24112720). Accumulates during tracheary element differentiation (PubMed:28921082). By light, NaCl, abscisic acid (ABA), wounding, and glucose stresses. Repressed by H(2)O(2) and cytokinin. Bushy phenotype (PubMed:24112720). Abnormal cuticle and pollen grain shapes, reduced levels of wax and cutin monomers, unusual lipidic cytoplasmatic inclusions in epidermal cells, inter-organ postgenital fusions, and altered morphology of trichomes and pavement cells (PubMed:24112720, PubMed:20035035). Altered petal and silique morphology, fusion of seeds, and changes in levels of cutin monomers in flowers and siliques associated with the suppression of the expression of a large number of cuticle-associated genes (PubMed:20035035). Altered root suberin composition, as well as root expression of suberin biosynthetic genes (PubMed:20035035). Highly susceptibility to salt and reduced root branching. Excess in sterol (e.g. campesterol) composition (PubMed:24112720). Vascular patterning defects in cotyledons and the floral stem, with a stronger phenotype in plant missing also ABCG9 and ABCG14 (PubMed:24112720). Both single and double mutants abcg11 abcg12 exhibit ABCG12-containing membrane inclusions protruded into the vacuole and contiguous with the endoplasmic reticulum (PubMed:20870961). Belongs to the ABC transporter superfamily. ABCG family. Eye pigment precursor importer (TC 3.A.1.204) subfamily.