Figure 4.

Evidence that the increased carboxylation rate is linked to decreased air channel diameter and increased air channel density: (a) V _cmax; (b) exposed mesophyll area per one‐sided epidermal area; (c) mesophyll conductance, g _m, after square‐root transformation to equalize standard deviation; (d) palisade channel diameter; (e) palisade channel density in Col‐0, RBCS _pro:KRP1, ATML1_pro:KRP1 and CA1_pro:RBRi leaves, as indicated. Values are means; error bars are SEMs. Values were measured in leaves from at least five independent plants (n ≥ 5) except for: (a) Col‐0, n = 5; (c) Col‐0, n = 3). Samples were compared with anova followed by post‐hoc Tukey's test. Columns indicated by similar letters within each analysis cannot be distinguished from each other at the 0.05 confidence limit.