Table I.

In vivo Chl a fluorescence measurements performed on wild type, OE-6×, OE-16×, and knockout mutant (im) of Arabidopsis

Fluorescence parameters measured include F_v/F_m, the relative reduction state of Q_A measured as 1 − qP and 1 − qL. Detached leaves were measured at their respective growth temperatures of 25°C (25/150) and 5°C (5/150) for 3-d cold-stressed leaves at an irradiance of 150 μmol photons m⁻² s⁻¹. a and b, Significance between means for leaves grown at 25°C; *, #, and ^, significance between means for leaves that were cold stressed at a confidence interval of 95%, where n = 2 with three replicate measurements per experiment ±se.

Condition	Genotypes	Fv/Fm	1 − qP	%	1 − qL	%
25/150	Wild type	0.784 ± 0.01a	0.106 ± 0.01a	100	0.266 ± 0.01ab	100
	OE-6×	0.758 ± 0.01a	0.130 ± 0.01a	123	0.301 ± 0.01a	113
	OE-16×	0.790 ± 0.01a	0.162 ± 0.04a	153	0.294 ± 0.03a	111
	im	0.763 ± 0.01a	0.078 ± 0.02a	74	0.208 ± 0.01b	78
5/150	Wild type	0.801 ± 0.02*	0.244 ± 0.02*	100	0.450 ± 0.02*	100
	OE-6×	0.755 ± 0.01#	0.300 ± 0.03*	123	0.496 ± 0.04*	110
	OE-16×	0.774 ± 0.01*#	0.274 ± 0.03*	112	0.452 ± 0.03*	100
	im	0.712 ± 0.02^	0.275 ± 0.02*	113	0.451 ± 0.01*	100