Table 1.

The rate constants of photoinhibition (k_PI) in min⁻¹ calculated by fitting the decline in F_v/F_m (Fig. 2) or in PSII-dependent oxygen evolution (Fig. 3), during the 45-min illumination at 22 °C or at 4 °C, to the first order reaction equation in non-cold-treated (NT) and cold-treated (CT) A. thaliana accessions

	kPI, min−1 (SD)
	Non-treated, at 22 °C		Non-treated, at 4 °C		Cold-treated, at 4 °C
	Fluorescence	Oxygen evolution	Fluorescence	Oxygen evolution	Fluorescence	Oxygen evolution
Rschew	0.0086a,A (0.0011)	0.0194a,A (0.0044)	0.0093a,A (0.0008)	0.0124a,B (0.0044)	0.0072a,B (0.0016)	0.0155ab,B (0.0048)
Tenela	0.0105b,A (0.0012)	0.0210ab,A (0.0024)	0.0115bc,A (0.0013)	0.0192b,A (0.0047)	0.0088a,B (0.0034)	0.0220a,A (0.0048)
Columbia-0	0.0128c,A (0.0014)	0.0247b,A (0.0036)	0.0111b,B (0.0027)	0.0179ab,B (0.0059)	0.0093a,B (0.0042)	0.0128b,B (0.0044)
Coimbra	0.0160d,A (0.0011)	0.0241ab,A (0.0051)	0.0135c,B (0.0027)	0.0226b,A (0.0080)	0.0105a,B (0.0053)	0.0124b,B (0.0044)

SD values (in parentheses) were calculated from at least three biological replicates. Statistically significant differences (P < 0.05) between accessions are indicated with lower-case letters and between treatment groups (between NT 22 °C and NT 4 °C, or between NT 4 °C and CT 4 °C) with upper-case letters. Significances of the differences between different accessions are shown only within the same treatment group. Significances of the differences between fluorescence and oxygen evolution data were not calculated