Table I.

Effects of high-light stress (3 d at 1,500 μmol m⁻² s⁻¹) on the pigment content (ng mm⁻²) and the tocopherol content (μg g⁻¹ fresh wt) of YL and ML of wild type and npq1 Arabidopsis grown at a PPFD of 250 μmol m⁻² s⁻¹

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.