Table 1. Chlorophyll fluorescence parameters used in this study.

Parameter	Formula	Description
Fv/Fm	(Fm- Fo)/Fm	Maximum quantum yield of PSII photochemistry measured in the dark-adapted state
ΦPSII	(F’m- Fs)/F’m	Effective quantum yield of photochemical energy conversion in PSII
Rfd	(Fm−Fs)/Fs	Ratio of fluorescence decline
NPQ	(Fm -F’m)/F’m	Non-photochemical quenching of maximum fluorescence
PIABS	$\frac{\mathrm{RC}}{\mathrm{ABS}}\cdot \frac{{\Phi }_{\mathrm{Po}}}{1-{\Phi }_{\mathrm{Po}}}\cdot \frac{{\Psi }_{\mathrm{o}}}{1-{\Psi }_{\mathrm{o}}}$	Performance index on absorption basis