Fig. 1. Variations in photosynthetic rate (Ps), stomatal conductance (Cs), water use efficiency (WUE), transpiration rate (E), internal CO2 and ozone
flux in potato plants at 30
and 60 DAE under different treatments of O3 and CO2 in combination. Values are mean
SE (n = 6). Lines showing different values indicate significant differences among
treatments at p < 0.05 according to Duncan’s test. DAE: Days after emergence