Fig. 4.

Net canopy CO₂ assimilation (μmol CO₂ s⁻¹ plant⁻¹) (A) and total root respiration (μmol CO₂ s⁻¹ plant⁻¹) (B) at 35 DAP in greenhouse mesocosms under water-stressed and well-watered conditions. The data shown are means of four replicates for each of four genotypes in each phenotype category±SE. Different letters represent significant differences within each panel at the level of α=0.05. HCN: high CN; LCN: low CN.