Table 1. Chlorophyll and Carotenoid Contents of Leaf Rosettes of the Wild Type, met1-1, and met1-2 Grown under Different Light Regimes.
| Condition | Genotype | Chl a | Chl b | Chl a/b | Carotenoids |
|---|---|---|---|---|---|
| Normal lighta | Wild type | 1.25 ± 0.12 | 0.40 ± 0.02 | 3.1 ± 0.40 | 0.38 ± 0.07 |
| met1-1 | 1.21 ± 0.10 | 0.38 ± 0.03 | 3.1 ± 0.51 | 0.39 ± 0.05 | |
| met1-2 | 1.25 ± 0.11 | 0.39 ± 0.03 | 3.2 ± 0.61 | 0.36 ± 0.02 | |
| 3 d high lightb | Wild type | 0.88 ± 0.02 | 0.33 ± 0.01 | 2.6 ± 0.06 | 0.34 ± 0.01 |
| met1-1 | 0.81 ± 0.02 | 0.29 ± 0.01 | 2.7 ± 0.05 | 0.31 ± 0.02 | |
| met1-2 | 0.83 ± 0.03 | 0.33 ± 0.01 | 2.4 ± 0.05 | 0.31 ± 0.04 | |
| Fluctuating lightc | Wild type | 0.50 ± 0.02 | 0.15 ± 0.01 | 3.4 ± 0.44 | 0.17 ± 0.01 |
| met1-1 | 0.34 ± 0.02** | 0.12 ± 0.03 | 3.0 ± 0.62 | 0.13 ± 0.01* | |
| met1-2 | 0.37 ± 0.03** | 0.12 ± 0.03 | 3.2 ± 0.68 | 0.15 ± 0.01 |
Standard deviations are indicated. Asterisks mark the level of significance using a Student’s t test (*P < 0.01 and **P < 0.001). Chl, chlorophyll.
a
21-d-old plants grown at 80 μmol photons m−2 s−1 in a 16-h-light/8-h-dark period (n = 3).
b
Plants grown for 3 weeks at 80 μmol photons m−2 s−1 followed by 3 d at 1000 μmol photons m−2 s−1 in a 16-h-light/8-h-dark period (n = 3).
c
20-d-old plants grown under fluctuating white light conditions (alternating between 50 and 600 μmol photons m−2 s−1 every 10 min) during the 16-h light period (n = 3).