Figure 8.

A, Light response curves of B. sinuspersici at 340 μbar CO₂. B, The response of photosynthesis to varying levels of atmospheric CO₂ at 1,000 μmol quanta m⁻² s⁻¹. C, Response of photosynthesis of LL-treated plants to varying levels of CO₂ under 2% versus 21% O₂. White and black symbols denote B. sinuspersici grown in ML (400 μmol quanta m⁻² s⁻¹) and LL (20 μmol quanta m⁻² s⁻¹) intensities, respectively. For A and B, the results represent the average of three replicates on three separate branches. For C, the results are from individual measurements at 2% versus 21% O₂ (at a given C_i from two experiments on separate branches).