Table 1.
Definitions of the chlorophyll fluorescence parameters calculated from the five main chlorophyll fluorescence parameters listed in Table S1.
| Parameter | Definition | Calculation |
|---|---|---|
| Fv/Fm | Maximum efficiency of PSII photochemistry | Calculated as (Fm − Fo)/Fm |
| Fv/Fo | Efficiency of the water-splitting complex on the donor side of PSII | Calculated as (Fm − Fo)/Fo |
| Fv′/Fm′ | The efficiency of open PSII reaction centers | Calculated as (Fm′ − Fo′)/Fm′ |
| ΦPSII | The effective quantum yield of PSII photochemistry | Calculated as (Fm′ − Fs)/Fm′ |
| q p | The photochemical quenching, that is the redox state of the plastoquinone pool, is a measure of the number of open PSII reaction centers | Calculated as (Fm′ − Fs)/(Fm′ − Fo′) |
| NPQ | The non-photochemical quenching that reflects heat dissipation of excitation energy | Calculated as (Fm − Fm′)/Fm′ |
| ETR | The relative PSII electron transport rate | Calculated as ΦPSII × PAR × c × abs, where PAR is the photosynthetically active radiation c is 0.5, and abs is the total light absorption of the leaf taken as 0.84 |
| ΦNPQ | The quantum yield of regulated non-photochemical energy loss in PSII, that is heat dissipation for photoprotection | Calculated as Fs/Fm′ − Fs/Fm |
| ΦNO | The quantum yield of non-regulated energy loss in PSII | Calculated as Fs/Fm |
| EXC | Excess excitation energy | Calculated as (Fv/Fm − ΦPSII)/(Fv/Fm) |