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Osmotic adjustment and hormonal regulation of stomatal responses to vapour pressure deficit in sunflower


Cardoso, AA and Brodribb, TJ and Kane, CN and DaMatta, FM and McAdam, SAM, Osmotic adjustment and hormonal regulation of stomatal responses to vapour pressure deficit in sunflower, AOB Plants, 12, (4) pp. 1-8. ISSN 2041-2851 (2020) [Refereed Article]

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The Author(s) 2020. This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

DOI: doi:10.1093/aobpla/plaa025


Dynamic variation of the stomatal pore in response to changes in leaf-air vapour pressure difference (VPD) constitutes a critical regulation of daytime gas exchange. The stomatal response to VPD has been associated with both foliage abscisic acid (ABA) and leaf water potential (W l); however, causation remains a matter of debate. Here, we seek to separate hydraulic and hormonal control of stomatal aperture by manipulating the osmotic potential of sunflower leaves. In addition, we test whether stomatal responses to VPD in an ABA-deficient mutant (w-1) of sunflower are similar to the wild type. Stomatal apertures during VPD transitions were closely linked with foliage ABA levels in sunflower plants with contrasting osmotic potentials. In addition, we observed that the inability to synthesize ABA at high VPD in w-1 plants was associated with no dynamic or steady-state stomatal response to VPD. These results for sunflower are consistent with a hormonal, ABA-mediated stomatal responses to VPD rather than a hydraulic-driven stomatal response to VPD.

Item Details

Item Type:Refereed Article
Keywords:abscisic acid, leaf osmotical potential, leaf turgor loss point, stomatal closure, vapour pressure deficit, wilty mutant
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:Cardoso, AA (Ms Amanda Cardoso)
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
ID Code:152562
Year Published:2020
Web of Science® Times Cited:12
Deposited By:Research Division
Deposited On:2022-08-22
Last Modified:2022-09-15
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