Table 1.

Pigment Content of the Wild Type, npq1, szl1, and szl1 npq1

Wild Typenpq1szl1szl1 npq1
ParameterLLHLLLHLLLHLLLHL
Total chlorophyll (nmol cm−2)21.9 ± 0.521.3 ± 1.522.5 ± 0.722.8 ± 1.221.9 ± 2.022.3 ± 1.620.9 ± 1.321.2 ± 0.8
Chl a/b3.31 ± 0.023.29 ± 0.043.46 ± 0.073.33 ± 0.013.37 ± 0.093.36 ± 0.073.35 ± 0.033.40 ± 0.06
Total carotenoids (mmol/mol Chl a)293.1 ± 11.6287.9 ± 4.6273.6 ± 6.8277.5 ± 6.4264.8 ± 18.8277.3 ± 5.3280.6 ± 2.9281.6 ± 8.0
VAZ pool size (mmol/mol Chl a)48.4 ± 3.349.6 ± 2.741.6 ± 0.844.7 ± 2.49.4 ± 0.210.2 ± 0.211.7 ± 0.712.5 ± 0.2
Violaxanthin (mmol/mol Chl a)46.2 ± 3.710.6 ± 0.239.6 ± 0.743.4 ± 1.37.2 ± 0.53.9 ± 0.09.7 ± 0.910.4 ± 0.1
Antheraxanthin (mmol/mol Chl a)2.3 ± 0.412.6 ± 0.91.8 ± 0.11.9 ± 0.22.1 ± 0.42.5 ± 0.32.0 ± 0.22.1 ± 0.2
Zeaxanthin (mmol/mol Chl a)026.3 ± 3.10003.8 ± 0.200
Lutein (mmol/mol Chl a)123.2 ± 1.7125.8 ± 2.0127.5 ± 4.5123.8 ± 2.0200.2 ± 15.0211.7 ± 5.1210.7 ± 3.0212.1 ± 5.7
Neoxanthin (mmol/mol Chl a)32.3 ± 3.132.7 ± 2.728.0 ± 0.929.5 ± 1.06.7 ± 0.77.8 ± 0.38.5 ± 1.19.7 ± 0.7
β-Carotene (mmol/mol Chl a)76.5 ± 4.377.7 ± 3.174.7 ± 1.177.4 ± 3.631.9 ± 2.631.9 ± 1.232.9 ± 1.732.2 ± 1.5
α-Carotene (mmol/mol Chl a)2.6 ± 0.92.2 ± 0.31.9 ± 0.11.9 ± 0.016.8 ± 0.915.7 ± 0.616.9 ± 0.515.1 ± 0.2
β-Branch/α-branch1.16 ± 0.051.16 ± 0.021.11 ± 0.021.20 ± 0.010.22 ± 0.000.20 ± 0.000.23 ± 0.000.24 ± 0.00
  • Pigment measurements were performed before and after exposure of LL-grown plants to HL (2000 μmol photons m−2 s−1) for 30 min. Data are presented as the means ± sd (n = 9). Chl a/b, chlorophyll a/b; Chl a, chlorophyll a.