Fig. 8.

(A) Modelled rate of CO₂ assimilation as a function of intercellular CO₂ partial pressure, C_i, for the C₄ photosynthetic pathway at three leaf temperatures of 15, 25, and 35 °C and an irradiance of 2000 µmol m^–2 s^–1. At 15 °C, the CO₂ assimilation rate is enzyme limited at all C_i. For 25 °C and 35 °C, the arrow indicates the transition from enzyme limitation at low C_i to electron transport limitation at high C_i. Parameters used are given in Table 1. (B) Intial slope (dA/dC_i) calculated from Equation 52 as a function of leaf temperature. Parameters used are given in Table 1.