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Related Experiment Videos

Do Stomata Respond to CO(2) Concentrations Other than Intercellular?

K A Mott1

  • 1Biology Department UMC 45, Utah State University, Logan, Utah 84322-4500.

Plant Physiology
|January 1, 1988
PubMed
Summary

Stomata respond only to intercellular carbon dioxide (CO2) concentration, not external or pore concentrations. This finding clarifies how plants regulate gas exchange under varying CO2 levels.

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Area of Science:

  • Plant Physiology
  • Photosynthesis Research
  • Environmental Plant Science

Background:

  • Stomatal regulation is crucial for plant survival and productivity.
  • Previous research often assumed stomata respond solely to intercellular CO2.
  • Uncertainty existed regarding stomatal sensitivity to external and pore CO2 concentrations.

Purpose of the Study:

  • To investigate whether guard cells are sensitive to CO2 concentrations at the leaf surface or within the stomatal pore.
  • To determine the primary CO2 sensing mechanism in stomatal regulation.
  • To refine models of stomatal response to atmospheric CO2 changes.

Main Methods:

  • Utilized amphistomatous leaves of Xanthium strumarium L. and Helianthus annuus L.
  • Applied asymmetric CO2 concentrations to different leaf surfaces.
  • Independently manipulated intercellular and leaf surface CO2 levels to isolate responses.

Main Results:

  • Stomatal response to intercellular CO2 remained consistent regardless of leaf surface CO2.
  • Stomata showed no response to variations in leaf surface CO2 when intercellular CO2 was constant.
  • Evidence suggests insensitivity to CO2 concentrations in the pore and on the leaf exterior.

Conclusions:

  • Guard cells primarily sense and respond to intercellular CO2 concentration.
  • Leaf surface and stomatal pore CO2 concentrations do not significantly influence stomatal aperture.
  • This clarifies the mechanism of stomatal CO2 sensing in plants.

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