Table 4. Activity of enzymatic antioxidants in leaves of plants grown at varying salt stress for 48 h that were treated with 0.5 mM γ- aminobutyric acid (GABA) or left untreated.
| Treatment | Superoxide dismutase (U·g−1) | Peroxidase (U·g−1·min−1) | Catalase (U·g−1·min−1) | Ascorbate peroxidase (U·g−1·min−1) |
|---|---|---|---|---|
| 0 mM NaCl | 52.14 ± 1.94c | 13.02 ± 0.77cd | 15.11 ± 0.55b | 20.47 ± 1.92c |
| 150 mM NaCl | 125.25 ± 4.38b | 19.79 ± 2.04b | 17.36 ± 0.79b | 32.14 ± 2.67b |
| 300 mM NaCl | 31.47 ± 1.75e | 8.41 ± 0.45e | 10.74 ± 0.67d | 10.34 ± 1.85e |
| 0 mM NaCl + 0.5 mM GABA | 54.57 ± 1.49c | 14.12 ± 2.55c | 14.74 ± 0.84bc | 21.24 ± 1.76c |
| 150 mM NaCl + 0.5 mMGABA | 144.32 ± 3.58a | 27.54 ± 1.88a | 21.21 ± 1.76a | 45.96 ± 2.44a |
| 300 mM NaCl + 0.5 mMGABA | 41.39 ± 2.01d | 10.21 ± 1.15de | 12.29 ± 0.63 cd | 15.88 ± 1.20d |
Values are mean ± SE. Values with the same letters in a column are not significantly different at P = 0.05 (LSD test).