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Linking turgor with ABA biosynthesis: implications for stomatal responses to vapour pressure deficit across land plants

Citation

McAdam, SAM and Brodribb, TJ, Linking turgor with ABA biosynthesis: implications for stomatal responses to vapour pressure deficit across land plants, Plant Physiology, 171 pp. 2008-2016. ISSN 0032-0889 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 American Society of Plant Biologist

DOI: doi:10.1104/pp.16.00380

Abstract

Stomatal responses to changes in vapour pressure deficit (VPD) constitute the predominant form of daytime gas exchange regulation in plants. Stomatal closure in response to increased VPD is driven by the rapid up-regulation of foliar ABA biosynthesis and ABA levels in angiosperms, however very little is known about the physiological trigger for this increase in ABA biosynthesis at increased VPD Using a novel method of modifying leaf cell turgor by the application of external pressures, we test whether changes in turgor pressure can trigger increases in foliar ABA levels over 20 minutes, a period of time most relevant to the stomatal response to VPD. We found in angiosperm species that the biosynthesis of ABA was triggered by reductions in leaf turgor; and in two species tested, that a higher sensitivity of ABA synthesis to leaf turgor corresponded with a higher stomatal sensitivity to VPD. In contrast, representative species from non-flowering plant lineages did not show a rapid turgor triggered increase in foliar ABA levels, which is consistent with previous studies demonstrating passive stomatal responses to changes in VPD in these lineages. Our method provides a new tool for characterising the response of stomata to water availability.

Item Details

Item Type:Refereed Article
Keywords:abscisic acid (ABA), turgor, biosynthesis, stomata, vapour pressure deficit, evolution
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:McAdam, SAM (Dr Scott McAdam)
Author:Brodribb, TJ (Dr Tim Brodribb)
ID Code:109123
Year Published:2016
Funding Support:Australian Research Council (DE140100946)
Deposited By:Plant Science
Deposited On:2016-05-25
Last Modified:2017-06-21
Downloads:0

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