Phosphoenolpyruvate carboxylase (PEPC) is an enzyme that irreversibly catalyzes the conversion of phosphoenolpyruvate and bicarbonate to oxaloacetate and inorganic phosphorus in the presence of Mg2+. It is essential for the primary assimilation of CO(2) in Crassulacean acid metabolism plants and significantly influences the diurnal rhythm of plant metabolism [1] [2].