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Saturation Kinetics of the Velocity of Stomatal Closing in Response to CO₂¹

^a Michigan State University-Atomic Energy Commission Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48823

Stomatal closing movements in response to changes from CO₂-free to CO₂-containing air were recorded in leaf sections of Zea mays using air flow porometers. The response to CO₂ was fast; the shortest lag between the application of 300 microliters CO₂ per liter of air and the beginning of a stomatal response was 3 seconds. The velocity of stomatal closing increased with CO₂ concentration and approached its maximal value between 10³ and 10⁴ microliters CO₂ per liter of air. The CO₂ concentration at which the closing velocity reached half its maximal value was approximately 200 microliters CO₂ per liter of air, both in the light and in darkness. This indicates that the mechanism of stomatal responses to CO₂ is the same in both light regimes and that the range of stomatal sensitivity to changes in CO₂ concentration coincides with the range of CO₂ concentrations known to occur in the intercellular spaces of illuminated leaves.

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