Fig. 3.

A/C _i response curves for leaves of maize exposed to salinity and shade. Responses of assimilation rates to intercellular CO₂ (A/C _i curves) measured at a light intensity of 1800 µmol m^–2 s^–1 and a leaf temperature of 26 °C. Data points are the average of two replicates. Lines are the mathematical fits using the C₄ photosynthesis model (von Caemmerer, 2000). Maize plants were grown in full sunlight and irrigated with water (control, filled circle), 50mM NaCl (Salt-50, half-filled triangle), or 100mM NaCl (Salt-100, filled triangle), or grown in 20% sunlight (shade, open circle).