Figure 4.

The rate of O₂ evolution (A), net HCO₃⁻ uptake (B), and gross CO₂ uptake (C) as a function of the HCO₃⁻ concentration in medium during steady-state photosynthesis in WT (▾) and the CMP+ mutant (○ and ●). Cells were grown under high-CO₂ conditions at a light intensity of 250 μmol of photons m⁻²⋅s⁻¹ with NH₄⁺ (○) or NO₃⁻ (● and ▾) as the nitrogen source. Assays were done at 30°C and pH 8.2.