Fig. 2.

Average of two crop growing years (2016–17 and 2017–18) data on (A) leaf area index (LAI) and (B) photosynthetic rate (Pn) during vegetative and flowering stages of the growth of HD 2967 and C-306 wheat cultivars under elevated CO₂ (EC), elevated O₃ (EO) and the combined interactive treatment of EC X EO (ECO). Error bars show standard deviations. Different lower cases show significant difference (at p < 0.05 level) among different treatments within the same year according to Duncan's test.