Table 2.
Photosynthetic light-response parameters.
| Treatment | Pnmax (µmol/m2/s) | α | Rd (µmol/m2/s) | LCP (µmol/m2/s) | LSP (µmol/m2/s) |
|---|---|---|---|---|---|
| CT | 9.19 ± 0.007a | 0.06 ± 0.003b | 1.63 ± 0.029abc | 29.47 ± 1.015a | 1113.86 ± 11.919a |
| Cd5 | 5.78 ± 0.139b | 0.13 ± 0.006a | 1.81 ± 0.112ab | 17.92 ± 0.968a | 2326.13 ± 1157.22a |
| Cd20 | 4.56 ± 0.043c | 0.05 ± 0.003b | 1.32 ± 0.161bc | 30.37 ± 3.252a | 1182.54 ± 100.105a |
| Cd50 | 1.82 ± 0.027d | 0.06 ± 0.008b | 1.21 ± 0.122c | 105.59 ± 70.914a | 868.16 ± 3.473a |
| Cd100 | 1.45 ± 0.014e | 0.06 ± 0.003b | 1.83 ± 0.065a | − 42.29 ± 112.027a | 723.38 ± 2.234a |
Pnmax: Maximum net photosynthetic rate; α: Initial quantum efficiency; Rd: Dark respiration rate; LCP: Light compensation point; LSP: Light saturation point. R2: 0.94–0.99. Different lowercase letters in the same column indicate significant differences between treatments with different cadmium concentrations.