Table 2. The physiological responses during seedling were shown in three cultivars under different Cd stresses.
All the tested indexes were measured based on the fresh weight. The different letters represent significant difference among different Cd treatment concentrations within the same cultivar.
| Cd treatments (mg·L−1) | Catalase activity (mg·g−1·min−1) | Soluble sugar content (%) | Root activity TTC oxidative (μg·g−1·h−1) | Chlorophyll a (mg·g−1) | Chlorophyll b (mg·g−1) | Carotenoid (mg·g−1) | Ratio of chlorophyll a to chlorophyll b | |
|---|---|---|---|---|---|---|---|---|
| XH | 0 | 8.82 ± 2.41c | 1.05 ± 0.14d | 2,370 ± 604b | 1.12 ± 0.09a | 0.16 ± 0.04a | 0.28 ± 0.05a | 6.89 ± 0.66a |
| 2.5 | 18.87 ± 4.63c | 4.69 ± 0.08a | 3,985 ± 571ab | 1.03 ± 0.38a | 0.15 ± 0.02a | 0.29 ± 0.02a | 6.82 ± 0.56a | |
| 5 | 13.37 ± 3.41c | 4.11 ± 0.02ab | 5,314 ± 1171a | 0.94 ± 0.16a | 0.17 ± 0.04a | 0.25 ± 0.02a | 5.79 ± 1.23ab | |
| 10 | 18.42 ± 3.91c | 3.98 ± 0.06b | 3,213 ± 1063abc | 1.06 ± 0.29a | 0.18 ± 0.01a | 0.27 ± 0.02a | 5.97 ± 0.70ab | |
| 20 | 36.94 ± 15.92b | 3.00 ± 0.16c | 3,468 ± 2164abc | 1.00 ± 0.36a | 0.17 ± 0.03a | 0.25 ± 0.03a | 5.95 ± 0.76ab | |
| 40 | 55.11 ± 0.48a | 3.20 ± 0.28c | 1,642 ± 599c | 0.84 ± 2.46a | 0.16 ± 0.12a | 0.19 ± 0.13b | 5.47 ± 0.70b | |
| LZ | 0 | 17.73 ± 2.57c | 0.98 ± 0.04c | 1,614 ± 339b | 1.28 ± 0.06ab | 0.22 ± 0.02a | 0.22 ± 0.19ab | 5.85 ± 0.58ab |
| 2.5 | 21.33 ± 5.23c | 5.04 ± 0.24a | 2,592 ± 1675ab | 1.43 ± 0.30a | 0.21 ± 0.05a | 0.40 ± 0.06a | 7.00 ± 0.40a | |
| 5 | 23.80 ± 7.41c | 4.36 ± 0.07ab | 3,207 ± 1339ab | 1.12 ± 0.41ab | 0.20 ± 0.03a | 0.29 ± 0.01ab | 5.67 ± 0.45b | |
| 10 | 26.84 ± 3.79b | 4.23 ± 0.03ab | 3,542 ± 814a | 1.08 ± 0.58ab | 0.21 ± 0.01a | 0.27 ± 0.01b | 5.10 ± 0.10b | |
| 20 | 40.57 ± 4.35b | 4.06 ± 0.08b | 1,888 ± 999ab | 1.14 ± 0.35ab | 0.18 ± 0.00a | 0.29 ± 0.01b | 6.32 ± 0.46ab | |
| 40 | 58.80 ± 7.63a | 3.76 ± 0.14b | 1,590 ± 486b | 1.01 ± 0.91b | 0.20 ± 0.02a | 0.23 ± 0.07b | 4.95 ± 1.17b | |
| DF | 0 | 10.55 ± 6.70b | 1.16 ± 0.09c | 3,907 ± 1432a | 1.06 ± 0.16a | 0.18 ± 0.03a | 0.29 ± 0.02a | 6.12 ± 0.57b |
| 2.5 | 12.85 ± 1.76b | 4.71 ± 0.12a | 2,466 ± 412ab | 0.85 ± 1.12ab | 0.11 ± 0.02a | 0.25 ± 0.08ab | 7.80 ± 0.76a | |
| 5 | 16.52 ± 4.03b | 3.98 ± 0.05ab | 1,807 ± 226b | 0.95 ± 0.73abc | 0.16 ± 0.02a | 0.30 ± 0.01a | 5.86 ± 0.93b | |
| 10 | 28.14 ± 11.09ab | 3.86 ± 0.03ab | 1,978 ± 428ab | 0.91 ± 0.77bc | 0.14 ± 0.01a | 0.25 ± 0.02ab | 6.48 ± 0.42ab | |
| 20 | 31.42 ± 5.54a | 3.04 ± 0.07b | 1,972 ± 627ab | 0.82 ± 0.43bc | 0.15 ± 0.03a | 0.21 ± 0.02b | 5.56 ± 0.83b | |
| 40 | – | 3.12 ± 0.04b | 2,468 ± 565ab | 0.72 ± 3.41c | 0.14 ± 0.00a | 0.09 ± 0.08b | 5.18 ± 0.29b | |