The Respiration Dependent Malate Accumulation in Leaves of a Crassulacean Acid Metabolism Plant, Kalanchoë daigremontiana Hamet et Perr.

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Summary The relationship between malate accumulation and respiration during the dark period was studied by using a Crassulacean Acid Metabolism (CAM) plant, Kalanchoe daigremontiana. The malate accumulation by K. daigremontiana during the dark period was completely inhibited in oxygen-free air. Regardless of the presence or absence of oxygen, the phosphoenolpyruvate level in leaf cells was almost constant and higher than the Km value of phosphoenolpyruvate carboxylase, a key enzyme of CO2-dark fixation in CAM plants. The concentration of CO2, the other substrate of the enzyme, is rate-limiting in the presence of oxygen but not rate-limiting in the absence of oxygen. The malate accumulation was strongly dependent upon the respiration rate. In the presence of a respiratory inhibitor, KCN, or oxygen-free air, malate accumulation was completely inhibited. It was suggested from these results that malate accumulation and preservation with plants on CAM mode during the dark period needed an energy supply from respiration.

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