MRP4 — Zea mays

Summary

ZM00001EB003490 (MRP4) on maize chromosome 1 encodes an ATP-binding cassette (ABC) transporter of the ABCC subfamily, with sulfonylurea receptor, ABA-GE transmembrane transporter, arsenite-transporting ATPase, and ABC-type phytochelatin/xenobiotic transporter activities. The gene is associated with vacuolar and vesicle membrane localisation, and linked to processes including ABA-GE transmembrane transport, sulfate homeostasis, inositol phosphate metabolism, arsenite and aluminium ion transport, detoxification, polyphosphate signaling, and response to water. MRP4 is associated with grain weight, seed viability, root length, plant height, stamen number, anthocyanin content, brassinosteroid and auxin sensitivity, and cell elongation. Related genes in other species are linked to arsenic and cadmium tolerance, drought sensitivity, stomatal movement, water use efficiency, seed phytic acid content, and yield traits.