Fig. 3.

Effects of application of Na₂SeO₄ or Na₂SeO₃ at different concentrations on activities of CAT, SOD, and POD in durum wheat roots and shoots exposed to salt stress. Values are means of five replicates ± SD. Different letters indicate significant differences at P < 0.05. FW fresh weight, CAT catalase, SOD superoxide dismutase, POD peroxidase. Control 0 mM NaCl + 0 μM Se (only deionized water), S0 50 mM NaCl + 0 μM Na₂SeO₄ (or Na₂SeO₃), S1 50 mM NaCl + 0.1 μM Na₂SeO₄ (or Na₂SeO₃), S250 mM NaCl + 1 μM Na₂SeO₄ (or Na₂SeO₃), S3 50 mM NaCl + 2 μM Na₂SeO₄ (or Na₂SeO₃), S4 50 mM NaCl + 4 μM Na₂SeO₄ (or Na₂SeO₃), S5 50 mM NaCl + 8 μM Na₂SeO₄ (or Na₂SeO₃), S6 50 mM NaCl + 10 μM Na₂SeO₄ (orNa₂SeO₃)