Fig. 5.

Values of the Rubisco specificity factor for CO₂/O₂ (S_c/o) (A) and the Michaelis–Menten constants for CO₂ (K_c) (B) and O₂ (K_o) (C) at a range of temperatures. Values for these parameters were obtained at discrete temperatures from in vivo gas-phase data (shown in Table 4) after applying Eq. 12 and converted to the liquid phase by Eqs 8–10 (Table 1 for corresponding Henry’s law constants to convert between liquid-phase and gas-phase equivalents). For comparative purposes, in vitro C₃ average values for S_c/o and K_c have been also included (using data shown in Table 3). In (C), in vitro K_o data for Atriplex glabriuscula (Badger and Collatz 1977, shown in Table 2) that have been widely used to model leaf photosynthesis (see Introduction) have been also included.