Figure 2.

Twenty-four-hour net CO₂ exchange by shoots of three species of CAM plants. A, K. daigremontiana: 30°C, 185 μmol m⁻² s⁻¹ light/17°C dark, dew point 15°C; B, Kalanchoe beharensis: 30°C, 185 μmol m⁻² s⁻¹ light/17°C dark, dew point 15°C; and C, Xerosicyos dangyui: 30°C, 200 μmol m⁻² s⁻¹ light/17°C dark, dew point 15°C. A through C depict net CO₂ exchange during the final 24 h of experiments that lasted between 18 and 28 12-h-light/12-h-dark cycles.