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  • Title: Uprooting an abscisic acid paradigm: Shoots are the primary source.
    Author: McAdam SA, Manzi M, Ross JJ, Brodribb TJ, Gómez-Cadenas A.
    Journal: Plant Signal Behav; 2016 Jun 02; 11(6):e1169359. PubMed ID: 27031537.
    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.
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