Table 2.
Formulae used to calculate chlorophyll fluorescence parameters
| Parameter | Description | Formula |
| F v/F m | The maximum photochemistry efficiency of PSII | F v/F m=(F m−F 0)/F m |
| F v'/F m' | The efficiency of excitation energy capture by open PSII reaction center | F v'/F m'=(F m'−F 0')/F m' |
| qP | The photochemical quenching coefficient | qP=(F m'−F s)/(F m'−F 0') |
| NPQ | The non-photochemical quenching coefficient | NPQ=(F m−F m')/F m' |
| ETRII | The electron transport rate of PSII | ETRII=Y II×PPFD×0.84×0.5 |
| Y II | The quantum efficiency of PSII photochemistry | Y II=(F m'−F s)/F m' |
| Y NO | The quantum yield of non-regulated energy of PSII | Y NO=F s/F m |
| Y NPQ | The quantum yield of regulated energy of PSII | Y NPQ=1−Y II−Y NO |
| ETRI | The electron transport rate of PSI | ETRI=Y I×PPFD×0.84×0.5 |
| Y I | The effective photochemical quantum yield of PSI | Y I=1−Y ND−Y NA |
| Y ND | The donor side limitation of PSI | Y ND=1−P700 red |
| Y NA | The acceptor side limitation of PSI | Y NA=(P m−P m')/P m |
F v and F v', variable fluorescences which yield in the dark-and light-adapted states; F m and F m', dark-and light adapted maximal fluorescences