Table 1.

Definition of fluorescence parameters and coefficients.

Parameter	Definition
F0	Minimum fluorescence in the dark-adapted state
F0′	Minimum fluorescence in the light-adapted state
FM dark	Maximum fluorescence in the dark-adapted state
FM′	Maximum fluorescence in the light-adapted state
FM	Maximum fluorescence estimated as the highest FM′ in irradiance-response curves
Ft	Steady-state fluorescence
NPQ	Non-photochemical chlorophyll fluorescence quenching
qP	Photochemical quenching of variable chlorophyll fluorescence
Y	Actual quantum yield of photochemical energy conversion in PSII