title: The role of ABCG-type ABC transporters in phytohormone transport.
abstract: Plant hormones (phytohormones) integrate endogenous and exogenous signals thus synchronizing plant growth with environmental and developmental changes. Similar to animals, phytohormones have distinct source and target tissues, hence controlled transport and focused targeting are required for their functions. Many evidences accumulated in the last years about the regulation of long-distance and directional transport of phytohormones. ATP-binding cassette (ABC) transporters turned out to play major roles in routing phytohormones not only in the plant body but also towards the outer environment. The ABCG-type proteins ABCG25 and ABCG40 are high affinity abscisic acid (ABA) transporters. ABCG14 is highly co-expressed with cytokinin biosynthesis and is the major root-to-shoot cytokinin transporter. Pleiotropic drug resistance1 (PDR1) from Petunia hybrida transports strigolactones (SLs) from the root tip to the plant shoot but also outside to the rhizosphere, where SLs are the main attractants to mycorrhizal fungi. Last but not least, ABCG36 and ABCG37 possibly play a dual role in coumarine and IBA transport.
authors.affiliation: Institute of Plant Biology and Microbiology, University Zurich, Zollikerstrasse 107, 8008 Zurich, Switzerland lorenzo.borghi@uzh.ch.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Borghi
authors.affiliation: Institute of Plant Biology and Microbiology, University Zurich, Zollikerstrasse 107, 8008 Zurich, Switzerland.
authors.forename: Joohyun
authors.initials: J
authors.lastname: Kang
authors.affiliation: Pohang University of Science and Technology-Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Donghwi
authors.initials: D
authors.lastname: Ko
authors.affiliation: Pohang University of Science and Technology-Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Youngsook
authors.initials: Y
authors.lastname: Lee
authors.affiliation: Institute of Plant Biology and Microbiology, University Zurich, Zollikerstrasse 107, 8008 Zurich, Switzerland.
authors.forename: Enrico
authors.initials: E
authors.lastname: Martinoia
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism*; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D001692:Biological Transport; D008954:Models, Biological; D015394:Molecular Structure; D005810:Multigene Family; D010937:Plant Growth Regulators / Q000737:chemistry / Q000378:metabolism*; D018517:Plant Roots / Q000235:genetics / Q000378:metabolism; D018520:Plant Shoots / Q000235:genetics / Q000378:metabolism
chemical_list: D018528:ATP-Binding Cassette Transporters; D029681:Arabidopsis Proteins; D010937:Plant Growth Regulators
keywords: ABCG transporters; auxin; cytokinins; long distance hormonal transport; phytohormones; strigolactone