Table 1.

Formulae and explanation of the technical data of the OJIP curves and the selected JIP-test parameters used in this study ¹.

Technical Fluorescence Parameters
Ft	fluorescence at time t after onset of actinic illumination
FO ≅ F20μs	minimal fluorescence, when all PSII RCs are open
FL ≡ F150μs	fluorescence intensity at the L-step (150 μs) of OJIP
FK ≡ F300μs	fluorescence intensity at the K-step (300 μs) of OJIP
FJ ≡ F2ms	fluorescence intensity at the J-step (2 ms) of OJIP
FI ≡ F30ms	fluorescence intensity at the I-step (30 ms) of OJIP
FP (= M)	maximal fluorescence, at the peak P of OJIP
Fv ≡ Ft − FO	variable fluorescence at time t
Vt ≡ (Ft − FO)/(FM − FO)	relative variable fluorescence at time t
VJ = (FJ − FO)/(FM − FO)	relative variable fluorescence at the J-step
VI = (FI − FO)/(FM − FO)	relative variable fluorescence at the I-step
Quantum efficiencies or flux ratios
φPo = PHI(P0) = TR0/ABS = 1 − FO/FM	maximum quantum yield for primary photochemistry
ψΕo = PSI0 = ET0/TR0 = (1 − VJ)	probability that an electron moves further than QA−
φEo = PHI(E0) = ET0/ABS = (1 − FO/FM) (1 − VJ)	quantum yield for electron transport (ET)
Phenomenological energy fluxes (per excited leaf cross-section-CS)
ABS/CS = Chl/CS	absorption flux per CS
TR0/CS = φPo·(ABS/CS)	trapped energy flux per CS
ET0/CS = φPo·ψΕo·(ABS/CS)	electron transport flux per CS
Density of reaction center (QA-reducing PSII reaction center–RC)
RC/CS = φPo·(VJ/M0)·(ABS/CS)	density of QA-reducing PSII RCs per CS
QA-reducing centers = (RC/RCreference)·(ABS/ABSreference) = [(RC/CS)treatment/(RC/CS)control]·[(ABS/CS)treatment/(ABS/CS)control]	fraction of QA-reducing PSII RCs
RJ = (ψΕo(control) − ψΕo(treatment))/ψΕo(control) = (VJ(treatment) − VJ(control))/(1 − VJ(control))	number of PSII RCs with QB-site filled by PSII inhibitor
Performance indexes
$\mathrm{P}{\mathrm{I}}_{\mathrm{A}\mathrm{B}\mathrm{S}}$ ≡ $\frac{{\mathsf{\gamma }}_{\mathrm{RC}}}{1-{\mathsf{\gamma }}_{\mathrm{RC}}}·\frac{{\mathsf{\phi }}_{\mathrm{Po}}}{1-{\mathsf{\phi }}_{\mathrm{Po}}}·\frac{{\mathsf{\Psi }}_{\mathrm{Eo}}}{1-{\mathsf{\Psi }}_{\mathrm{Eo}}}$	performance index for energy conservation from photons absorbed by PSII to the reduction of intersystem electron acceptors
Phenomenological energy fluxes (per excited leaf cross-section-CS)
${\mathrm{DF}}_{\mathrm{ABS}}=\log \left({\mathrm{PI}}_{\mathrm{ABS}}\right)=\log \left(\frac{\mathrm{RC}}{\mathrm{ABS}}\right)+\log (\frac{{\mathsf{\varphi }}_{\mathrm{Po}}}{1-{\mathsf{\varphi }}_{\mathrm{Po}}})+\log (\frac{{\mathsf{\psi }}_{\mathrm{Eo}}}{1-{\mathsf{\psi }}_{\mathrm{Eo}}})$	driving force on absorption basis

¹ Subscript “0” (or “o” when written after another subscript) indicates that the parameter refers to the onset of illumination, when all RCs are assumed to be open.