Table 1.
Effects of exogenous melatonin on photosynthetic electron partitions after four days chilling stress.
| Treatments | Je(PSII) μmolm-2s-1 | Je(PCR) μmolm-2s-1 | Je(PCO) μmolm-2s-1 | Ja21% μmolm-2s-1 | Ja(O2-independent) μmolm-2s-1 | Ja(O2-dependent) μmolm-2s-1 |
|---|---|---|---|---|---|---|
| Control | 75.57 ± 0.86a | 61.01 ± 0.77a | 11.60 ± 0.79c | 2.96 ± 0.41c | 1.97 ± 0.20c | 0.99 ± 0.22c |
| Melatonin | 77.27 ± 2.86a | 60.02 ± 1.88a | 14.10 ± 0.90b | 3.16 ± 0.16c | 2.20 ± 0.16c | 0.96 ± 0.12c |
| Chilling | 43.35 ± 1.57c | 17.8 ± 0.41c | 12.85 ± 0.52bc | 12.82 ± 0.90a | 3.42 ± 0.28b | 9.40 ± 1.12a |
| Chilling + Melatonin | 52.97 ± 1.41b | 24.51 ± 0.12b | 18.32 ± 0.61a | 10.14 ± 1.10b | 4.41 ± 0.44a | 5.73 ± 0.66b |
Control (28/18°C); Control + Melatonin (200 μM melatonin, 28/18°C); Chilling (15/8°C); Chilling + Melatonin (200 μM melatonin, 15/8°C). Data are means ± SD of three replicates. Different letters indicate significant (P < 0.05) differences based on Duncan’s multiple range text.