Table I.
Tocopherol level (α-tocopherol + γ-tocopherol), PSII photochemical efficiency (Fv/Fm), and lipid peroxidation (thermoluminescence [TL] signal amplitude at 80°C) in tobacco leaves grown under control conditions (70 μmol photon m−2 s−1, 25°C) and in young (Y) leaves acclimated for 2 weeks to strong light stress at low temperature (1,000 μmol m−2 s−1, 10°C)
| Leaf Samples | α- + γ-Tocopherols | Fv/Fm | TL (80°C) |
|---|---|---|---|
| ng cm−2 | |||
| Control leaves | |||
| WT | 171.2 ± 30.0 | 0.791 ± 0.006 | 380 ± 75 |
| T6 | 91.8 ± 24.2 | 0.778 ± 0.009 | 375 ± 41 |
| T10 | 90.0 ± 30.0 | 0.784 ± 0.008 | 450 ± 41 |
| T20 | 125.4 ± 28.3 | 0.782 ± 0.006 | 406 ± 31 |
| Acclimated Y leaves | |||
| WT | 442.6 ± 35.0 | 0.716 ± 0.031 | 492 ± 67 |
| T6 | 189.5 ± 15.5 | 0.695 ± 0.019 | 353 ± 38 |
| T10 | 184.5 ± 6.5 | 0.696 ± 0.019 | 575 ± 25 |
| 20 | 335.4 ± 85.7 | 0.700 ± 0.041 | 646 ± 251 |
Data are mean values of at least three experiments ± sd.