| Fo |
Minimal fluorescence when all photosystem II reaction centers are open (at 50millisecond) |
– |
| Fj |
Fluorescence intensity at the J-step (at 2 millisecond) |
– |
| Fi |
Fluorescence intensity at the I-step (at 30 millisecond) |
– |
| Fm (Fp) |
Maximal fluoresxence intensity when all photosystem II reaction centers are closed |
– |
| Vj |
Relative variable Chl fluorescence (at 2 millisecond) |
(FJ −Fo)/(FM −Fo) |
| Vi |
Relative variable Chl fluorescence (at 30 millisecond) |
(FI −Fo)/(FM −Fo) |
| Fv/Fm |
Maximum quantum yield of PSII photochemistry measured in the dark-adapted state |
(Fm −F0)/Fm |
| PIABS
|
Performance index on an absorption basis: the efficiency of energy conservation from absorbed photons to a reduction in intersystem electron carriers |
(RC/ABS) [(ΦPo/(1 −ΦPo)] [(1 −VJ)/(1 −(1 −VJ))] |
| Mo |
Slope at the beginning of the transient FO → FM, maximal fractional rate of photochemistry approximated initial slope (per millisecond) of the fluorescence transient V = f(t). This parameter reflects the rate at which photosystem II reaction centers are closed. It is a net value, because reduced QA can be reoxidized as a result of electron transport outside QA. |
4 (F300 −Fo )/(FM −Fo) |
| Ss |
Normalized total area above the OJIP curve (reflecting multiple turnover of QA reductions). The Ss minimum appears only when each QA is reduced only once the smallest SM turn-over (single turn-over) |
Area/(FM −Fo) |
| Specific fluxes per active PSII reaction center |
| ABS/RC |
Average absorbed photon flux per photosystem II reaction center |
Mo (1/VJ) (1/ ΦPo) |
| TRo/RC |
Energy flux trapped by one active photosystem II reaction center |
Mo (1/VJ) |
| ETo/RC |
Rate of electron transport flux from QA to QB per photosystem II reaction center |
Mo (1/VJ) (1 −VJ) |
| DIo/RC |
Energy flux not intercepted by a reaction center |
ABS/RC −TRo/RC |
| REo/RC |
Electron flux leading to a reduction in the PSI end acceptor |
Mo (1/VJ) (1 −VI) |
| ΦPo |
Quantum yield of primary photochemistry; probability that an absorbed photon leads to a reduction in QA |
(FM −Fo)/FM |
