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. 2021 Feb 16;9(4):1949–1960. doi: 10.1002/fsn3.2160

TABLE 1.

Chlorophyll fluorescence parameters

Fo The first reliable fluorescence value after the onset of actinic illumination
Fm Maximum value under saturating illumination
Fv Maximum variable Chlorophyll fluorescence
Fo/Fm A parameter related to changes in heat dissipation in the photosystem II antenna
Fv/Fm The maximum photochemical efficiency of light harvesting in PSII
Fv/Fo Quantum yield of primary PSII photochemistry, represents the contribution to the PI of the light reactions for primary photochemistry
VJ The fluorescence at J step (2 ms), F2ms
VI The fluorescence at I step
ABS/RC Specific fluxes or specific activities
DI0/RC
TR0/RC
ET0/RC
PIABS Performance index
PIT