Table 5.

The effect of light orientation and dark chilling on whole leaf maximal rate of photosynthesis (Amax), apparent quantum yield (φ), curvature degree (θ) and mitochondrial respiration (R_d) in plants that had been maintained at optimal growth temperatures (controls) or subjected to dark chilling for either one or two consecutive nights

Data represent the mean values ± SE of nine plants per treatment and was calculated accordingly to von Caemmerer (2000) and Lambers et al. (1998) from the whole leaf light-response curves (See Fig. 4). Statistical analysis was performed separately for each parameter. The different letters represent statistical differences at P<0.05.

	Amax(μmol m-2 s-1)	ϕ(*102 μmol μmol-1)	θ(relative units)	Rd(μmol m-2 s-1)
Light Adaxial
Control	41 ± 2.4 a	5.7 ± 0.58 a	0.64 ± 0.045 a	1.9 ± 0.06 a
1 Night Chilling	26 ± 0.6 b	4.6 ± 0.66 a	0.82 ± 0.044 a	1.8 ± 0.08 a
2 Nights Chilling	39 ± 2.7 a	6.5 ± 0.23 a	0.69 ± 0.090 a	1.9 ± 0.13 a
Light Abaxial
Control	43 ± 1.7 a	4.2 ± 0.40 a	0.64 ± 0.073 a	1.6 ± 0.05 a
1 Night Chilling	37 ± 1.0 a	5.4 ± 0.12 a	0.61 ± 0.035 a	1.6 ± 0.03 a
2 Nights Chilling	37 ± 1.0 a	4.6 ± 0.50 a	0.64 ± 0.073 a	1.7 ± 0.07 a