TABLE 1.
Lead (Pb) and reduced glutathione (GSH) mediated hydrogen peroxide (H2O2), hydroxyl ion (OH•) and malondialdehyde (MDA) contents in upland cotton leaves and roots.
| Treatments | Terminal leaves | Median leaves | Primary roots | Secondary roots |
| H2O2 (μM g–1 FW) | ||||
| Control | 753.6b | 65.371.7c | 45.262.4b | 9.980.6c |
| 500 μM Pb | 1134.4a | 95.333.3a | 64.002.3a | 15.241.8a |
| 50 μM GSH | 794.8b | 78.588.4b | 37.871.2c | 9.830.8c |
| 50 μM GSH + 500 μM Pb | 638.5c | 56.898.9c | 32.991.8d | 12.571.1b |
| OH• (μM g–1 FW) | ||||
| Control | 0.020.001c | 0.020.001c | 0.030.002c | 0.020.004c |
| 500 μM Pb | 0.060.002a | 0.050.001a | 0.120.004a | 0.100.007a |
| 50 μM GSH | 0.030.001b | 0.020.002c | 0.020.002c | 0.020.001c |
| 50 μM GSH + 500 μM Pb | 0.030.001b | 0.030.003b | 0.060.002b | 0.070.011b |
| MDA (μM g–1 FW) | ||||
| Control | 923.9b | 766.5bc | 70.9b | 90.9b |
| 500 μM Pb | 1726.3a | 1295.6a | 141.6a | 110.9a |
| 50 μM GSH | 724.5d | 649.9c | 70.9b | 70.9c |
| 50 μM GSH + 500 μM Pb | 825.3c | 877.1b | 60.1b | 70.9c |
Data presented here was obtained from three independent biological replications. Means possessing same alphabets are not significant at 5% probability as determined by Duncan’s multiple range test. The values are means ± standard deviation (SD).