Figure 4.

The extent of isotopic equilibrium (θ) as a function of the rate constant of leaf CA (k_CA mol m⁻² s⁻¹ Pa⁻¹) in wild-type and anti-CA F. bidentis plants. The predicted values of θ were determined from in vitro CA assays using Equation 9 (A) and the measured values of θ were determined from Δ¹⁸O using Equation 7 (B). Symbols and gas exchange conditions are as in Figure 1. Calculations were made with g_w = 10 mol m⁻² s⁻¹ Pa⁻¹.