4.6 Article

Molecular mechanisms of stomatal closure in response to rising vapour pressure deficit

Journal

NEW PHYTOLOGIST
Volume 232, Issue 2, Pages 468-475

Publisher

WILEY
DOI: 10.1111/nph.17592

Keywords

abscisic acid (ABA); Arabidopsis; passive hydraulic stomatal closure; stomata; transpiration; vapour pressure deficit

Categories

Funding

  1. Institute of Technology and Estonian Research Council [PRG719]
  2. National Science Foundation [MCB-1900567]
  3. National Institutes of Health [GM060396-ES010337]

Ask authors/readers for more resources

Vapour pressure deficit (VPD) is an important indicator of atmospheric drought and evaporative pressure on plants, affecting stomatal closure response. There are still many unanswered questions regarding the molecular VPD-sensing and signalling mechanisms in stomatal guard cells that require further research.
Vapour pressure deficit (VPD), the difference between the saturation and actual air vapour pressures, indicates the level of atmospheric drought and evaporative pressure on plants. VPD increases during climate change due to changes in air temperature and relative humidity. Rising VPD induces stomatal closure to counteract the VPD-mediated evaporative water loss from plants. There are important gaps in our understanding of the molecular VPD-sensing and signalling mechanisms in stomatal guard cells. Here, we discuss recent advances, research directions and open questions with respect to the three components that participate in VPD-induced stomatal closure in Arabidopsis, including: (1) abscisic acid (ABA)-dependent and (2) ABA-independent regulation of the protein kinase OPEN STOMATA 1 (OST1), and (3) the passive hydraulic stomatal response. In the ABA-dependent component, two models are proposed: ABA may be rapidly synthesised or its basal levels may be involved in the stomatal VPD response. Further studies on stomatal VPD signalling should clarify: (1) whether OST1 activation above basal activity is needed for VPD responses, (2) which components are involved in ABA-independent regulation of OST1, (3) the role of other potential OST1 targets in VPD signalling, and (4) to which extent OST1 contributes to stomatal VPD sensitivity in other plant species.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available