Figure 6

Conceptual diagram depicting how the light intensities required to support half-saturated \(({\rm{K}}\tfrac{1}{2}{\rm{sat}})\) and optimum rates change with changing CO₂. While the solid line represents the default response to rising light levels, the dotted line represents an increase in substrate uptake efficiency with rising CO₂, the dashed line represents an increase in H⁺ inhibition with rising CO₂ and the dot-dashed line represents an increase in both substrate uptake efficiency and H⁺ inhibition with rising CO₂.