Features brilliant in Crassulacean acid metabolism (CAM) metabolism are their stomata often close during the day to avoid the evaporation from the leaves, while at night, stomata often open to absorb CO2 and accumulate CO2 in malic acid. Metabolism of malic acid during the day will help the plants discharged CO2 and they can use this CO2 combines with water and light to carry photosynthesis. This is a fundamental difference in the mechanism of CO2 fixed in the dark phase of the photosynthesis in CAM plants compared with C3 and C4 plants. Through this unique mechanism that CAM plants can still survive in and adapt to the climate of arid lands. The purpose of this paper is collected the main data from our experiments to show the different ways in malate metabolism among these typical CAM species, Kalanchoë pinata, Ananas comosus and Hoya carnosa in the daytime. Details discussion on the relationships between cytosolic and mitochondrial malic metabolism and their physiological function were included in this review.
