Table 1. The differences in pigment composition and chlorophyll fluorescence parameters of wild-type and npq4 cells after the high light pre-treatment.

	WT	SD	npq4	SD	% from WT
Lutein	15.06	1.32	16.03	0.89	+6.4
Total VAZ	9.09	0.43	10.31	0.77	+13.4*
Chl. a:b	2.49	0.11	2.70	0.08	+8.5*
Fv/Fm	0.63	0.01	0.61	0.01	−3.8*
Fo (DCMU)	0.100	0.004	0.107	0.003	+7.0

‘WT’ = wild-type, ‘Total VAZ’ = total xanthophyll pool of violaxanthin, antheraxanthin and zeaxanthin calculated on a mol basis and expressed as molx100:mol total chlorophyll, as for lutein. ‘Chl. a:b’ = ratio of chlorophyll a:b calculated on a mol basis, ‘F_v/F_m’ = maximum quantum yield of PSII, ‘Fo (DCMU)’ = Fo measured in cultures at 10 μg mL⁻¹ chlorophyll in the presence of 10 μM DCMU, ‘% from WT’ was calculated as (npq4-WT)/WT × 100 and ‘*’ corresponds to a significant difference (P < 0.05), n = 4 ± SD.