Table 3.
Effect of different Pb concentrations on enzymatic anti-oxidants of three scented rice cultivars at heading and maturity stages.
| Rice cultivars | Pb | HS | MS | ||||||
|---|---|---|---|---|---|---|---|---|---|
| SOD | POD | CAT | APX | SOD | POD | CAT | APX | ||
| U min−1 g−1 FW | U min−1 g−1 FW | ||||||||
| Meixiangzhan-2 | 0 | 405.94 ± 15.46ab | 77.73 ± 0.27b | 55.53 ± 2.34a | 0.25 ± 0.06a | 335.16 ± 39.66a | 70.20 ± 0.76b | 9.73 ± 0.77c | 0.30 ± 0.05a |
| 400 | 509.59 ± 47.18a | 127.07 ± 4.25a | 64.60 ± 6.13a | 0.30 ± 0.08a | 205.94 ± 18.82b | 105.20 ± 2.64a | 14.51 ± 0.44b | 0.38 ± 0.12a | |
| 800 | 345.66 ± 23.05bc | 81.93 ± 3.82b | 28.07 ± 0.87b | 0.15 ± 0.01a | 211.42 ± 17.26b | 51.40 ± 3.62c | 18.54 ± 0.47a | 0.51 ± 0.06a | |
| 1,200 | 242.47 ± 44.82c | 99.00 ± 1.50b | 28.27 ± 0.87b | 0.17 ± 0.01a | 100.46 ± 6.73c | 44.73 ± 2.29c | 7.33 ± 0.24d | 0.53 ± 0.30a | |
| Means | 375.92 | 96.43 | 44.12 | 0.22 | 213.25 | 67.88 | 12.53 | 0.43 | |
| LSD 0.05 | 115.36 | 24.19 | 10.89 | 0.17 | 77.69 | 8.30 | 1.68 | 0.54 | |
| Xiangyaxianzhan | 0 | 202.74 ± 29.77b | 121.53 ± 0.33ab | 27.40 ± 1.91a | 0.50 ± 0.03a | 129.22 ± 3.57a | 55.47 ± 2.63ab | 6.40 ± 0.50b | 0.70 ± 0.49a |
| 400 | 268.95 ± 18.82a | 129.54 ± 1.21ab | 28.27 ± 0.71a | 0.72 ± 0.13a | 136.07 ± 8.89a | 56.60 ± 1.75a | 8.67 ± 0.13a | 1.15 ± 0.55a | |
| 800 | 240.64 ± 12.66ab | 135.80 ± 13.36a | 28.68 ± 0.52a | 0.97 ± 0.32a | 143.84 ± 8.81a | 50.40 ± 1.29bc | 10.07 ± 0.58a | 1.41 ± 0.82a | |
| 1,200 | 229.68 ± 11.74ab | 108.00 ± 0.42b | 23.07 ± 0.24b | 1.17 ± 0.27a | 124.20 ± 6.34a | 46.33 ± 0.44c | 6.93 ± 0.59b | 0.42 ± 0.12a | |
| Means | 235.50 | 123.72 | 26.86 | 0.84 | 133.33 | 52.20 | 8.02 | 0.92 | |
| LSD 0.05 | 63.96 | 21.88 | 3.45 | 0.72 | 23.60 | 5.61 | 1.60 | 1.81 | |
| Basmati-385 | 0 | 115.53 ± 5.94a | 65.53 ± 0.24b | 24.80 ± 0.50a | 0.17 ± 0.07a | 109.59 ± 3.95b | 55.40 ± 1.29b | 13.77 ± 0.83b | 0.34 ± 0.12a |
| 400 | 157.08 ± 33.22a | 71.11 ± 0.67b | 25.87 ± 1.35a | 0.20 ± 0.02a | 163.93 ± 7.31a | 62.93 ± 2.01a | 18.60 ± 1.93a | 0.80 ± 0.25a | |
| 800 | 172.60 ± 10.46a | 72.13 ± 5.62b | 26.13 ± 2.10a | 0.26 ± 0.04a | 189.95 ± 0.46a | 61.13 ± 1.45a | 19.60 ± 0.42a | 0.72 ± 0.08a | |
| 1,200 | 158.45 ± 13.57a | 104.67 ± 0.79a | 18.33 ± 0.41b | 0.28 ± 0.09a | 168.95 ± 14.27a | 65.67 ± 1.29a | 19.93 ± 1.16a | 0.85 ± 0.21a | |
| Means | 150.92 | 78.36 | 23.78 | 0.23 | 158.11 | 61.28 | 17.98 | 0.68 | |
| LSD 0.05 | 61.71 | 9.33 | 4.21 | 0.20 | 26.93 | 5.01 | 3.97 | 0.58 | |
Values are the means of three independent determinations ± SE. Values with different lower case letters differ significantly at P < 0.05 according to least significant difference test. HS, Heading stage; MS, Maturity stage; SOD, Superoxide dismutase, POD, Peroxidases, CAT, Catalases; APX, Ascorbate peroxidases.