title: Uprooting an abscisic acid paradigm: Shoots are the primary source.
abstract: In the past, a conventional wisdom has been that abscisic acid (ABA) is a xylem-transported hormone that is synthesized in the roots, while acting in the shoot to close stomata in response to a decrease in plant water status. Now, however, evidence from two studies, which we have conducted independently, challenges this root-sourced ABA paradigm. We show that foliage-derived ABA has a major influence over root development and that leaves are the predominant location for ABA biosynthesis during drought stress.
authors.affiliation: a School of Biological Sciences, University of Tasmania , Hobart , Australia.
authors.forename: Scott A M
authors.initials: SA
authors.lastname: McAdam
authors.affiliation: b Ecofisiologia y Biotecnologia, Dept. Ciències Agraries i del Medi Natural, Universitat Jaume I. Castellón de la Plana , Spain.
authors.forename: Matías
authors.initials: M
authors.lastname: Manzi
authors.affiliation: a School of Biological Sciences, University of Tasmania , Hobart , Australia.
authors.forename: John J
authors.initials: JJ
authors.lastname: Ross
authors.affiliation: a School of Biological Sciences, University of Tasmania , Hobart , Australia.
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Brodribb
authors.affiliation: b Ecofisiologia y Biotecnologia, Dept. Ciències Agraries i del Medi Natural, Universitat Jaume I. Castellón de la Plana , Spain.
authors.forename: Aurelio
authors.initials: A
authors.lastname: Gómez-Cadenas
mesh_terms: D000040:Abscisic Acid / Q000096:biosynthesis / Q000378:metabolism*; D001692:Biological Transport; D008954:Models, Biological; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D018520:Plant Shoots / Q000378:metabolism*
chemical_list: D000040:Abscisic Acid
keywords: Abscisic acid (ABA); root growth; shoot to root signaling; stomata; water stress