Figure 3.

O₂ effects on the net CO₂ assimilation (a), net CO₂ assimilation as a percentage of the maximum rates (b), quantum yield of PSII (c), electron use efficiency for CO₂ assimilation (d), reduction state of the Q_A pool (e), and efficiency of PSII open centers (f) in A. edulis wild-type plants. Measurements were made at an ambient CO₂ concentrations of 93 (•) and 33 Pa (○), with corresponding intercellular CO₂ values of 28.3 ± 3.7 and 15.8 ± 0.9 Pa, respectively. Error bars are the Fisher lsd values at α = 0.05. Error bar without symbol is the Fisher lsd value for the O₂ × CO₂ interaction.