Abstract
Crassulacean acid metabolism (CAM) is an adaptation characterized mainly by fixation of atmospheric carbon dioxide at night by the enzyme phosphoenolpyruvate carboxylase (PEPC). Due to the closure of stomata during the day, the water use efficiency of CAM plants is higher than that of plants that carry out C3 or C4 photosynthesis, allowing the colonization of more xeric environments. CAM …