Potential photosynthesis.

<p>Changes in photosynthetic capacity (A_max) in the leaves of <i>C. arabica</i> (Icatu and IPR 108) and <i>C. canephora</i> (Conilon CL 153) grown under 380 (white bar) and 700 (black bar) μL CO₂ L^-1. The mean values + SE (n = 6) followed by different letters express significant differences between cultivars for the same CO₂ treatment (a, b) or between CO₂ treatments within the same cultivar (r, s). The ANOVA for A_max showed significant differences between cultivars for the same growth CO₂ treatment.