Fig. 1

Mean comparisons of (a) carotenoids (Cars) concentration and activities of (b) catalase (CAT), (c) ascorbate peroxidase (APX), and (d) guaiacol peroxidase (POX) of fennel, ajwain and anise medicinal species under four concentrations of NaCl (0, 40, 80, and 120 mM) in irrigation water. Each mean is accompanied by an error bar. Means bearing a same letter do not differ significantly according to the least significant difference (LSD) at the 0.05 level of statistical probability.