CO2 response for CO2 assimilation rate (A, ○), gross O2 evolution rate (JO2, ▵), RuBP pool size (●), Rubisco activity (⧫), and Rubisco activation state (□) for PEPC mutant A. edulis at two O2 pressures, 0.3 and 210 mbar. Leaf temperature was 28°C, PFD = 1,400 μmol m−2 s−1. Each point is from a different leaf of similar age.