Table 1.
Different parameters measured or calculated on leaves grown under different light qualities (the proportion of total PAR that is from the blue rather than from the red part of the spectrum).
| Blue light percentage | 0 | 7 | 15 | 22 | 30 | 50 | 100 |
| Fv/Fm | 0.76 b | 0.80 a | 0.80 a | 0.80 a | 0.81 a | 0.81 a | 0.81 a |
| ΦPSII | 0.65 d | 0.74 c | 0.76 b | 0.76 a,b | 0.76 a, b | 0.77 a | 0.76 a,b,c |
| Fv/Fm–ΦPSII | 0.110 a | 0.055 b | 0.044 c | 0.040 c | 0.042 c | 0.034 c | 0.044 b,c |
| Quantum yield CO2 fixation (α) | 0.045 c | 0.052 a,b | 0.053 a | 0.053 a | 0.053 a | 0.048 b,c | 0.045 c |
| Rdark (μmol m−2 s−1) | 0.93 d | 1.17 c | 1.29 a,b,c | 1.39 a,b | 1.27 b,c | 1.45 a | 1.33 a,b,c |
| gsw ratio (abaxial:adaxial) | 2.7 a | 2.6 a | 2.1 a,b | 1.7 b,c | 1.7 b,c | 1.4 c | 1.7 b,c |
| Integrated absorptance | 90.0 d | 92.1 c | 92.4 b,c | 93.1 b,c | 94.0 a,b | 93.7 b | 95.4 a |
| Chl a:b (g g−1) | 3.24 d | 3.36 c | 3.51 a,b | 3.48 a,b | 3.42 b,c | 3.54 a | 3.54 a |
| N (% DW) | 5.7 a | 6.0 a | 5.7 a | 6.0 a | 6.1 a | 6.0 a | 6.2 a |
| C (% DW) | 39.6 a | 38.0 a | 36.8 a | 38.7 a | 37.7 a | 37.6 a | 37.7 a |
| C:N (g g−1) | 6.9 a | 6.4 a,b | 6.5 a,b | 6.4 a,b | 6.2 b | 6.2 b | 6.1 b |
| Chl:N (g g−1) | 5.1 a | 4.3 b,c | 4.6 a,b | 4.1 b,c,d | 4.3 b,c | 3.9 c,d | 3.7 d |
| PSS (phytochromes) | 0.89 | 0.89 | 0.89 | 0.89 | 0.88 | 0.87 | 0.51 |
Different letters indicate significant differences (P ≤0.05; n=5 or n=6, no variation for PSS).