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Uprooting an abscisic acid paradigm: Shoots are the primary source
Scott A M McAdam1, Matías Manzi2, John J Ross1
1a School of Biological Sciences, University of Tasmania , Hobart , Australia.
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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