Table 3. OJIP parameters calculated from the P&P imaging and nonimaging measurements.

Values represent medians ± se (n = 5 different plants). Asterisk signs denote significant differences between the two groups according to the Mann-Whitney test (*P < 0.05), which was done as a comparison of two methods: P&P imaging and nonimaging. Parameter definitions according to Stirbet and Govindjee (2011): V_I/J, relative variable fluorescence at the I/J step; M_o, approximate value of the initial slope of relative variable Chl fluorescence curve V_t; Φ_Po, maximum quantum yield of primary PSII photochemistry (equals F_v/F_m); ABS/RC, absorption flux/effective antenna size of an active reaction center; TRo/RC, trapped energy flux leading to a reduction of Q_A; ET2o/RC, electron transport flux further than Q_A; DIo/RC, dissipation flux.

Parameter	P&P Imaging	Nonimaging
Vj	0.46 ± 0.008	0.478 ± 0.005
Vi	0.9 ± 0.01	0.854 ± 0.005*
Mo	1.11 ± 0.023	1.412 ± 0.031*
ΦPo	0.820 ± 0.002	0.830 ± 0.001
ABS/RC	3.000 ± 0.027	3.527 ± 0.047*
TRo/RC	2.450 ± 0.019	2.935 ± 0.037*
ET2o/RC	1.310 ± 0.023	1.526 ± 0.013*
DIo/RC	0.530 ± 0.011	0.592 ± 0.010*