. 2008 Feb 2;101(5):689–699. doi: 10.1093/aob/mcn008

Table 3.

The response of winter barley plants non-acclimated, cold-acclimated (14 d at 2 °C) and cold-acclimated + subjected to non-lethal freezing temperatures (–5 °C during the night) to the high-light treatment (20 min of 1200 µmol m⁻² s⁻¹ at 5 °C)

	Plants
	Non-acclimated				Cold acclimated				Cold acclimated and frozen
Genotype	q_P	qE	qI	(F₀ – F_0HL)/F₀	q_P	qE	qI	(F₀ – F_0HL)/F₀	q_P	qE	qI	(F₀ – F_0HL)/F₀
‘Carola’	0·079^c	1·832^g	0·261^b	0·104^ab	0·103^b	2·010^de	0·196^c	0·025^e	0·103^b	2·011^de	0·195^c	0·030^de
POA4006	0·081^c	2·064^cd	0·198^c	0·045^cde	0·136^a	2·209^a	0·199^c	0·046^cde	0·135^a	2·136^b	0·238^b	0·059^cd
POA4044	0·078^c	1·937^ef	0·283^a	0·072^bc	0·105^b	2·093^bc	0·199^c	0·065^c	0·102^b	2·081^bc	0·200^c	0·069^c
POA4784	0·074^c	1·870^fg	0·273^ab	0·098^b	0·131^a	1·971^e	0·268^b	0·101^b	0·131^a	1·911^f	0·296^a	0·129^a

Photochemical quenching of chlorophyll fluorescence (q_P), components of non-photochemical quenching–fast-relaxating q_E and slow relaxating qI, as well as the change in F₀ observed during high-light treatment: (F₀–F_0HL)/F₀ was measured in two independent experiments, total in eight or six (frozen plants) replications.

Values of the same parameter with the same letter did not differ significantly at P = 0·05 (Duncan's multiple range test).