Table 5.

Summary of the major physiological traits as determined by leaf light response curves (Figure 6) from tomatoes grown under 12 h lighting (200 µmol m^–2 s^–1 red + 50 µmol m^–2 s^–1 blue, 06:00–18:00) and CL (200 µmol m^–2 s^–1 red, 06:00–18:00 + 50 µmol m^–2 s^–1 blue, 18:00–06:00).

Time of measurement	Light treatment	Respiration (µmol CO2 m−2 s−1)	Light compensation point (µmol m−2 s−1)	Quantum yield (µmol CO2 m−2 s−1/µmol m−2 s−1)	Pnmax (µmol CO2 m−2 s−1)
18 DIT	12 h lighting	−2.03 ± 0.38 A	28.83 ± 5.98 A	0.068 ± 0.001 A	30.61 ± 1.11 A
	Continuous lighting	−2.36 ± 0.23 A	35.62 ± 3.81 A	0.066 ± 0.001 A	27.94 ± 1.21 A
43 DIT	12 h lighting	−2.96 ± 0.19 A	40.45 ± 3.11 A	0.070 ± 0.001 A	32.06 ± 1.83 A
	Continuous lighting	−2.94 ± 0.15 A	46.84 ± 3.44 A	0.063 ± 0.005 A	29.98 ± 2.24 A

Respiration values were the averages of NCER when the light level was 0 µmol m⁻² s⁻¹. The light compensation point and quantum yield were calculated from a regression line (y = mx + b) fitted to the values between the PAR values of 0–100 µmol m⁻² s⁻¹. The photosynthetic maximum (Pn_max) was calculated from y = y_o + a(1 − e^(−b*x)). Values represent the mean ± the standard error of the mean with n = 4. The same letter (A) represents a no significant difference within a time point and of a given parameter at p < 0.05.