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The evolution of mechanisms driving the stomatal response to vapour pressure deficit


McAdam, SAM and Brodribb, TJ, The evolution of mechanisms driving the stomatal response to vapour pressure deficit, Plant Physiology, 167, (3) pp. 833-843. ISSN 0032-0889 (2015) [Refereed Article]

Copyright Statement

Copyright 2014 American Society of Plant Biologists

DOI: doi:10.1104/pp.114.252940


Stomatal responses to vapor pressure deficit (VPD) are a principal means by which vascular land plants regulate daytime transpiration. While much work has focused on characterizing and modeling this response, there remains no consensus as to the mechanism that drives it. Explanations range from passive regulation by leaf hydration to biochemical regulation by the phytohormone abscisic acid (ABA). We monitored ABA levels, leaf gas exchange, and water status in a diversity of vascular land plants exposed to a symmetrical, mild transition in VPD. The stomata in basal lineages of vascular plants, including gymnosperms, appeared to respond passively to changes in leaf water status induced by VPD perturbation, with minimal changes in foliar ABA levels and no hysteresis in stomatal action. In contrast, foliar ABA appeared to drive the stomatal response to VPD in our angiosperm samples. Increased foliar ABA level at high VPD in angiosperm species resulted in hysteresis in the recovery of stomatal conductance; this was most pronounced in herbaceous species. Increased levels of ABA in the leaf epidermis were found to originate from sites of synthesis in other parts of the leaf rather than from the guard cells themselves. The transition from a passive regulation to ABA regulation of the stomatal response to VPD in the earliest angiosperms is likely to have had critical implications for the ecological success of this lineage.

Item Details

Item Type:Refereed Article
Keywords:stomata, humidity, vapour pressure deficit (VPD), abscisic acid (ABA), hysteresis, leaf gas exchange
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
UTAS Author:McAdam, SAM (Dr Scott McAdam)
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
ID Code:98320
Year Published:2015
Web of Science® Times Cited:144
Deposited By:Plant Science
Deposited On:2015-02-11
Last Modified:2017-11-01

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