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초록· 키워드
The effect of CO<sub>2</sub> on the opening of stomata in the intact leaf of Commelina communis has been investigated. Full opening of stomatal apertures(around 18 μm) was achieved in the intact leaf by addition of CO<sub>2</sub>(900 μmol mol-1). At 90 minutes, the stomatal apertures of leaves treated with CO<sub>2</sub> free air were reduced. In contrast, stomata opened most widely with the treatment of CO<sub>2</sub> air at 90 minutes. The effects of light, CO<sub>2</sub> air and CO<sub>2</sub> free air on the change of membrane potential difference(PD) were measured. Fast hyperpolarization of guard cell membrane PD was recorded reaching up to -12 mV in response to light. If CO<sub>2</sub> free air was given firstly, there was no response. When light was given after CO<sub>2</sub> free air, the light effect was very clear. At the onset of CO<sub>2</sub> air, the PD showed a dramatic hyperpolarization to about -25 mV. Changes in the pH of apoplast in intact leaves in response to CO<sub>2</sub> air were observed. CO<sub>2</sub> air caused a change of 0.4 pH unit. Therefore, it can be hypothesized that CO<sub>2</sub> flowing could stimulate proton efflux which is a necessary precursor of stomatal opening.
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UCI(KEPA) : I410-ECN-0102-2023-451-001797107
