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. 2021 Dec 22;12:786309. doi: 10.3389/fpls.2021.786309

Table 1.

Chlorophyll fluorescence parameters used in this study.

Parameter Formula Description
Fv/Fm (Fm − F0)/Fm Maximum quantum yield of PSII photochemistry measured in the dark-adapted state
Fv′/Fm′ (Fm′ − F0’)/Fm′ Exciton transfer efficiency from antenna pigments to the reaction center of photosystem II (PSII) in the light-adapted state
Y(PSII) (Fm′ − Fs)/Fm′ Effective quantum yield of photochemical energy conversion in PSII
NPQ (Fm − Fm′)/Fm′ Non-photochemical quenching of maximum fluorescence
qP (Fm′ − Fs)/(Fm′ − F′0) Photochemical quenching of PSII
qN (Fm − F’m)/(Fm − F′0) Coefficient of non-photochemical quenching of variable fluorescence
Y(NO) 1/[NPQ + 1 + qL(Fm/F0–1)] Quantum yield of non-regulated energy dissipation in PSII
Rfd (Fm − Fs)/Fs Ratio of fluorescence decline