Table 3.
Effect of exogenous GABA on H2O2 content, CAT, SOD and APX activities in tomato seedlings under chilling stress
| Chilling stress | GABA concentration (μmolL−1) | H2O2 content (μmol·g−1 F) | CAT activity (U·g−1FW) | SOD activity (U·g−1FW) | APX activity (U·g−1FW) |
|---|---|---|---|---|---|
| – | Control | 3.50 ± 028 a | 2.93 ± 0.28 a | 24.54 ± 6.8 a | 2.89 ± 1.05 |
| + | 0 | 9.97 ± 1.08 c | 5.56 ± 0.6 b | 41.01 ± 7.6 c | 4.40 ± 0.91 |
| + | 100 | 7.76 ± 0.49 c | 7.44 ± 0.81 c | 35.64 ± 3.3 bc | 3.93 ± 0.90 |
| + | 250 | 6.09 ± 0.46 b | 7.87 ± 0.69 c | 31.90 ± 3.2 abc | 4.09 ± 0.62 |
| + | 500 | 4.26 ± 0.45 a | 14.59 ± 0.43 e | 31.40 ± 3.1 ab | 3.34 ± 0.71 |
| + | 750 | 4.13 ± 1.00 a | 12.21 ± 1.1 d | 26.73 ± 2.9 ab | 3.66 ± 0.58 |
| Significance | * | * | * | ns | |
Mean values ± Standard Error (SE), Values in the column followed by the different letters (a, b,c and d) in the same column indicate significant difference (P < 0.05) according to Duncan’s Multiple Range Test analysis. Combined letters (ab, cd and bc) in the same column indicate that rows with similar letters are not significant (P < 0.05)
(ns): non-significance at P < 0.05, (*): Significance at 0.05 levels
(−): not chilling treated seedlings, (+): chilling treated seedlings