Relationships between CO2 concentration within the leaf and photosynthesis during deacidification in a CAM plant, Kalanchoë pinnatum

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Abstract
The CO2 concentration within the leaf of Kalanchoë pinnatum (Persoon) was measured during deacidification in the light. When the acidified leaf was treated with DCMU, the CO2 concentration within the leaf was increased about 3‐fold as compared to that of the non‐treated leaf, concomitant with a decline in deacidification. Low light intensity during deacidification also increased CO2 concentration within the leaf. From these experiments, it was concluded that in order for deacidification to proceed, CO2 released from malate must be fixed continuously by photosynthesis. Otherwise, an equilibrium for malate decomposition is soon established and results in suppression of deacidification. Thus, the CO2 concentration within the leaf seems to be one of the regulatory factors of deacidification.