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Speedy small stomata?

John A Raven1

  • 1School of Plant Biology, University of Western Australia, 35 Stirling Hoghway, Crawley, WA 6009, Australia.

Journal of Experimental Botany
|March 11, 2014
PubMed
Summary
This summary is machine-generated.

Smaller stomata may open and close faster, potentially improving plant responses to environmental changes. This faster stomatal movement could be linked to increased enzyme activity within guard cells.

Keywords:
Carbonic anhydraseefficiencyflashing lightosmolarityphotoinhibitionratesafetystomatazinc.

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Area of Science:

  • Plant physiology
  • Biophysics

Background:

  • Stomatal size influences stomatal functioning, including opening and closing speeds.
  • Previous research suggests a link between stomatal size and physiological responses.

Purpose of the Study:

  • To investigate the relationship between stomatal size and the speed of stomatal opening and closing.
  • To explore the implications of stomatal size on physiological processes and environmental tracking.

Main Methods:

  • Theoretical calculations were performed to estimate the rate of osmolarity increase in stomata of different sizes.
  • The role of cytosolic carbonic anhydrase activity in guard cells was considered in relation to faster stomatal movement.

Main Results:

  • Calculations indicate that smaller stomata (10 μm) could achieve a 6-fold higher rate of osmolarity increase compared to larger stomata (60 μm).
  • This suggests a potential reduction in stomatal opening time from approximately 1 hour to 10 minutes for smaller stomata.
  • Faster stomatal movement in smaller stomata may allow for closer tracking of environmental variations, such as light intensity.

Conclusions:

  • Stomatal size is a critical factor influencing stomatal kinetics and physiological responses.
  • Faster stomatal movement in smaller stomata could enhance a plant's ability to adapt to fluctuating environmental conditions.
  • Further empirical data across a range of stomatal sizes is needed to validate these findings.