Figure 4.

Simulated response curve of the net CO ₂ assimilation rate (A _N) to intercellular CO ₂ partial pressures (C _i) under the conditions of the Laisk method for different scenarios of (photo)respired CO ₂ release. The solid lines represent CO ₂ response curves simulated at different irradiances I _inc (150, 100, 50 and 25 μmol m⁻² s⁻¹). The dashed line represents the net CO ₂ assimilation rate which equals the negative input value of the day respiration rate (R _d). The dashed‐dotted line represents the intercellular partial pressure which equals the CO ₂ compensation point (Γ*). (Photo)respired CO ₂ is released either in the inner cytosol (a), the cytosol gaps (b) or the outer cytosol (c).