Table I.
Compounds | 250 μmol m−2 s−1
|
1,500 μmol m−2 s−1
|
||||
---|---|---|---|---|---|---|
Wild-type ML | npq1 ML | WT
|
npq1
|
|||
ML | YL | ML | YL | |||
Photosynthetic pigments | ||||||
Neoxanthin | 5.2 ± 0.1 | 5.0 ± 0.1 | 6.4 ± 0.7 | 5.2 ± 0.2 | 4.5 ± 0.7 | 5.7 ± 0.4 |
V + A + Z | 7.7 ± 0.3 | 8.1 ± 1.0 | 20.0 ± 3.5 | 22.9 ± 0.8 | 13.9 ± 1.3 | 23.5 ± 2.2 |
Lutein | 24.1 ± 0.5 | 23.6 ± 1.9 | 35.4 ± 1.8 | 33.3 ± 1.7 | 26.5 ± 3.4 | 35.9 ± 1.4 |
β-Carotene | 12.5 ± 4.8 | 11.1 ± 2.7 | 14.9 ± 2.1 | 14.2 ± 2.2 | 13.9 ± 1.3 | 14.6 ± 1.7 |
Chl b | 74.6 ± 3.1 | 67.7 ± 4.9 | 74.2 ± 7.0 | 59.6 ± 3.2 | 48.1 ± 9.6 | 56.4 ± 3.1 |
Chla | 149.6 ± 5.8 | 139.8 ± 10.8 | 167.6 ± 19.1 | 141.4 ± 4.5 | 116.6 ± 22.7 | 138.5 ± 9.9 |
Chl a/Chl b | 2.01 | 2.06 | 2.25 | 2.37 | 2.42 | 2.45 |
Vitamin E | ||||||
α-Tocopherol | 23.5 ± 1.7 | 19.8 ± 0.9 | 57.2 ± 2.1 | 78.7 ± 5.1 | 43.8 ± 3.9 | 91.9 ± 3.7 |
γ-Tocopherol | 0.5 ± 0.3 | 0 | 15.5 ± 1.2 | 12.6 ± 0.1 | 12.4 ± 2.2 | 19.1 ± 2.6 |
Data are mean values of a minimum of three separate experiments ± sd. For the low-light growth conditions, only data of ML are given because there was no significant difference between YL and ML (wild type and npq1) with respect to their pigment and tocopherol content.