Table 2.
Chlorophyll fluorescence parameters of young expanding and fully expanded leaves of WT and la crys mutant of 18-day-old pea seedlings grown under negative (13 °C/21 °C DT/NT) and positive DIF (21 °C/13 °C DT/NT)
| Treatment/leaf/genotype | Fv/Fm | ETR (μmol e– m−2 s−1) | NPQ | Qp |
| Positive DIF/leaf 5/WT | 0.801±0.003 | 53.0±2.2 | 1.16±0.13 | 0.807±0.010 |
| Negative DIF/leaf 5/WT | 0.776±0.002 | 50.4±1.4 | 1.00±0.06 | 0.789±0.011 |
| Positive DIF/leaf 3/WT | 0.829±0.001 | 58.2±0.8 | 0.87±0.03 | 0.789±0.010 |
| Negative DIF/leaf 3/WT | 0.820±0.002 | 62.2±1.0 | 0.66±0.03 | 0.826±0.090 |
| Positive DIF/leaf 5/la crys | 0.821±0.001 | 60.5±0.4 | 0.86±0.98 | 0.832±0.002 |
| Negative DIF/leaf 5/la crys | 0.795±0.006 | 53.1±1.3 | 0.98±0.03 | 0.787±0.010 |
| Positive DIF/leaf 3/la crys | 0.834±0.001 | 58.1±1.5 | 1.06±0.08 | 0.792±0.011 |
| Negative DIF/leaf 3/la crys | 0.827±0.001 | 57.2±0.9 | 0.96±0.05 | 0.797±0.008 |
| Statistical analysis (ANOVA: GLM) | ||||
| DIF treatment | 0.000 | NS | NS | NS |
| Genotype | 0.000 | NS | NS | NS |
| Leaf | 0.000 | 0.000 | 0.017 | NS |
| DIF×genotype | NS | 0.010 | 0.039 | 0.027 |
| DIF×leaf | 0.000 | 0.001 | NS | 0.000 |
| Genotype×leaf | 0.001 | 0.000 | 0.000 | NS |
| Genotype×leaf×DIF treatment | NS | NS | NS | NS |
Fv/Fm represent maximal dark-adapted PSII efficiency, ETR is the electron transport rate through PSII at 210 μmol m−2 s−1 irradiance, NPQ is non-photochemical quenching, and Qp is the proportion of open PSII centres. Presented are means ±SE with n=7.