Table 5.
Effects of exogenous SA and NO on SOD, POD and CAT activities and MDA content and superoxide produce rate of peanut leaves
| Treatments | SOD activity (Unit mg-1protein) | POD activity (Unit mg-1protein) | CAT activity (Unit g-1protein) | MDA content (nmol g-1FW) | O2·-generation rate (μmol g-1 h-1FW) |
|---|---|---|---|---|---|
| CK | 2.36 ± 0.08b | 0.30 ± 0.04d | 0.058 ± 0.003c | 34.12 ± 3.98a | 6.41 ± 0.52a |
| EDTA-Fe | 2.34 ± 0.07b | 0.41 ± 0.03c | 0.067 ± 0.002b | 19.21 ± 1.64b | 4.73 ± 0.47bc |
| SA | 2.52 ± 0.06a | 0.47 ± 0.01c | 0.069 ± 0.001ab | 21.99 ± 3.71b | 5.28 ± 0.06ab |
| SNP | 2.52 ± 0.16a | 0.50 ± 0.09bc | 0.068 ± 0.001ab | 19.93 ± 1.93b | 4.55 ± 1.31bc |
| SA+SNP | 2.58 ± 0.03a | 0.64 ± 0.04a | 0.071 ± 0.001a | 17.31 ± 0.87b | 3.50 ± 0.32c |
| 1/2(SA+SNP) | 2.52 ± 0.05a | 0.57 ± 0.06ab | 0.069 ± 0.002ab | 18.77 ± 2.67b | 4.40 ± 1.53bc |
CK: hydroponic systems; EDTA-Fe: Hoagland nutrient solution containing 0.1 mM EDTA-Fe; SA: hydroponic systems and foliar application of 1.0 mM SA; SNP: hydroponic systems and foliar application of 2.5 mM SNP; SA+SNP: hydroponic systems and foliar application of 1.0 mM SA and 2.5 mM SNP; 1/2(SA+SNP): hydroponic systems and foliar application of 0.5 mM SA and 1.25 mM SNP. Different lower case letters in the same line indicate a significant difference (P < 0.05) between different treatments. Data are means ± SD of three replicate samples per treatment.