In CAM-plants, carbon dioxide required for photosynthesis enters the plant body during
Night, through the open stomata
In CAM-plants, the stomata open at night. This allows the entry of carbon dioxide in the leaves. The carbohydrate stored in plants are converted to PEP by glycolysis, which is carboxylated to malic acid. Thus, carbon dioxide is fused in plants as malic acid, which is stored inside vacuole. During day time, stomata closes and the malate is transported to chloroplast and undergoes decarboxylation and the released carbon dioxide is fixed by Calvin cycle.