Influence of O2- and CO2-concentrations on oscillations in the transpiration rate from oat plants in darkness |
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| Authors: | Rune Klockare Stig Olof Falk |
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| Institution: | R. Klockare and S. O. Falk, Department of Plant Physiology, University of Göteborg, Carl Skottsbergs Gata 22, S-413 19 Göteborg, Sweden. |
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| Abstract: | The effect of changed O2- and CO2-concentrations in air on oscillations in the transpiration rate of young oat plants in darkness has been investigated. Lowering the O2-concentration to 5% did not affect the oscillations. When the CO2 in the air was removed, the transpiration rate increased, and the oscillations ceased. When the CO2-concentration was raised to 0.3 or 3% the transpiration rate temporarily decreased, but the period of the oscillations was not changed. Further increase of the CO2-concentration caused, after a temporary decrease, an increased transpiration rate, and the oscillations eventually ceased. The period of the oscillations was influenced by the temperature: a lower temperature gave a longer period. It is concluded that substomatal O2-deficit or high CO2-concentration do not play a crucial role in the origin of these oscillations. |
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| Keywords: | Carbon dioxide darkness oat oxygen transpiration oscillations |
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