Table II. Chl a fluorescence parameter of LL- and HL-grown plants.

Leaves taken from LL- and HL-exposed wild-type and CAOx plants were dark adapted for 20 min before measurement of their minimal fluorescence (F_o), maximum fluorescence (F_m), and maximum primary photochemical efficiency (F_v/F_m) by a PAM 2100 fluorometer. The F_o, but not F_m or F_v/F_m, was significantly different (P < 0.001) in CAOx plants as compared with wild-type plants grown under LL and HL intensities. The experiment was repeated three times, and the values are means ± sd (n = 10).

Plant Line	Chl a Fluorescence
	Fo	Fm	Fv/Fm
WT-LL	0.20 ± 0.002	1.00 ± 0.003	0.79 ± 0.003
CAOx-LL	0.21 ± 0.004	1.03 ± 0.028	0.79 ± 0.003
WT-HL	0.19 ± 0.003	1.0 ± 0.024	0.80 ± 0.003
CAOx-HL	0.22 ± 0.004	1.12 ± 0.010	0.80 ± 0.0027