Abstract
The Crassulacean Acid Metabolism (CAM) allows the assimilation of CO2 with a greater water use efficiency rather than the C3 and C4 metabolisms. In the epiphytic C3-CAM facultative bromeliad Guzmania monostachia (Bromeliaceae, Tillandsioideae), the C3 maximizes its growth under favorable environmental conditions, while CAM is manifested in stressful conditions. Since different nitrogen so…