Uprooting an abscisic acid paradigm: Shoots are the primary source. (2nd June 2016)

• Record Type: Journal Article
• Authors: McAdam, Scott A. M.; Manzi, Matías; Ross, John J.; Brodribb, Timothy J.; Gómez-Cadenas, Aurelio
• Is Part Of: Plant signaling & behavior. Volume 11:Number 6(2016)
• Publication Date: 2016-06-02
• Subjects: Abscisic acid (ABA) -- root growth -- shoot to root signaling -- stomata -- water stress; Plant ecophysiology -- Periodicals; Plant cellular signal transduction -- Periodicals; Plant cellular signal transduction; Plant ecophysiology; Periodicals; Electronic journals; 581
• DOI: 10.1080/15592324.2016.1169359
• Languages: English
• ISSNs: 1559-2316

Abstract

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.