Uprooting an abscisic acid paradigm: Shoots are the primary source

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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.

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McAdam, S. A. M., Manzi, M., Ross, J. J., Brodribb, T. J., & Gómez-Cadenas, A. (2016). Uprooting an abscisic acid paradigm: Shoots are the primary source. Plant Signaling and Behavior, 11(6). https://doi.org/10.1080/15592324.2016.1169359

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