Fig. 3

a Time-course of stomatal conductance (G_s) (mmol m⁻² s⁻¹) and b Net assimilation of CO₂ (ACO₂) (mmol m⁻² s⁻¹) in the leaves of broccoli plants and plants treated with 10 mg l⁻¹ MWCNTs, 100 mM NaCl and 100 mM NaCl + 0^.10 mg l⁻¹ MWCNTs. Mean values ± standard errors are shown (n = 6). Bars with different letters are significantly different (P < 0.05) according to the Tukey test