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Seasonal average of photosynthetic carbon uptake (A, µmol CO2 m−2 s−1, A), stomatal conductance (gs, mol H2O m−2 s−1, B), intrinsic water use efficiency (iWUE, µmol mol−1, C), and [CO2] inside the leaf (Ci, µmol mol−1, D) from eight cultivars of cassava grown at ambient (AMB CO2) and elevated [CO2] (ELE CO2). Values are means ±SE (n=4). Treatments with different letters represent significant differences (P<0.1); underlining is used to help differentiate groups of letters.
