F0, minimum Chl fluorescence yield obtained with dark-adapted leaf; Fm, maximum Chl fluorescence yield obtained with dark-adapted leaf; Fv, variable fluorescence of the dark-adapted samples; Fv/Fm, maximal photochemical efficiency; NPQ, non-photochemical quenching; qP, photochemical quenching; ФPSII, yield of PSII photochemistry; Chl,chlorophyll; Anth, anthocyanin.