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Table 1 Chlorophyll fluorescence parameters measurable with FluorCam systems (following nomenclature in [6] or [36] regarding Rfd, respectively)

From: Establishment of integrated protocols for automated high throughput kinetic chlorophyll fluorescence analyses

Fluorescence parameter Definition
F, F′ Steady state fluorescence emission from dark- or light-adapted leaf, respectively
F0, F0 Minimal chlorophyll fluorescence intensity measured in the dark- or light-adapted state, respectively
Fm, Fm Maximal chlorophyll fluorescence intensity measured in the dark- or light-adapted state, respectively
Fv, Fv Variable chlorophyll fluorescence (Fm-F0) measured in the dark- or light-adapted state, respectively
Fq Difference in fluorescence between Fm′ and F′
Fv/Fm Maximum quantum yield of PSII photochemistry measured in the dark-adapted state
Fp Peak fluorescence during the initial phase of the Kautsky effect
Rfd Fluorescence decline ratio in steady-state (Fp − F′)/F′
ΦPSII PS II operating efficiency; effective quantum yield of photochemical energy conversion in PSII (Fq′/Fm′)
NPQ Non-photochemical quenching (Fm/Fm′) – 1
qL Fraction of PSII centers that are ‘open’ based on the lake model of PSII (Fq′/Fv′)(F0′/F′)
ETR Electron transport rate