Table 2.
Parameters from light response curves for the sun and shade leaves.
| PPFD μmol m-2 s-1 | An μmol m-2 s-1 | Ci μmol mol-1 | JC μmol m-2 s-1 | JO μmol m-2 s-1 | JO/JC μmol m-2 s-1 | ATP from CEF μmol m-2 s-1 | |
|---|---|---|---|---|---|---|---|
| Sun | 500 | 16.7 ± 0.5a | 237 ± 9a | 93 ± 1.5a | 37 ± 1.2a | 0.39 ± 0.02c | 14.9 ± 0.42a |
| 800 | 19.7 ± 0.8b | 212 ± 8b | 116 ± 2.1b | 58 ± 1.7b | 0.50 ± 0.01b | 18.4 ± 1.03b | |
| 1200 | 21.1 ± 0.4bc | 200 ± 7bc | 130 ± 2.6c | 75 ± 2.7c | 0.57 ± 0.01a | 20.3 ± 1.25bc | |
| 2000 | 22.2 ± 0.6c | 193 ± 8c | 136 ± 7.0c | 82 ± 8c | 0.60 ± 0.02a | 21.7 ± 1.61c | |
| Shade | 500 | 10.4 ± 0.8d | 280 ± 8d | 55 ± 4.0d | 19 ± 1d | 0.34 ± 0.01d | 8.2 ± 1.24d |
| 800 | 11.6 ± 1.5d | 270 ± 10d | 63 ± 4.1e | 23 ± 2.4de | 0.36 ± 0.01cd | 9.2 ± 1.14d | |
| 1200 | 12.3 ± 1.4d | 264 ± 10d | 66 ± 4.3e | 24 ± 2.6de | 0.37 ± 0.02cd | 9.9 ± 1.14d | |
| 2000 | 12.4 ± 1.4d | 261 ± 13d | 70 ± 4.2e | 26 ± 3.0e | 0.37 ± 0.03cd | 10.6 ± 1.27d |
Values for An, Ci, JC, JO, and JO/JC were obtained from simultaneously measurements of gas exchange and chlorophyll fluorescence. Contribution of CEF in ATP synthesis was calculated using the method from Walker et al. (2014). Data represent means ± SE (n = 4). Statistical analysis was determined between different treatments. Different characters indicate significant differences (Tukey’s multiple comparison test, P < 0.05).