Abbreviations: AQE -apparent quantum efficiency; BF -blue film; Car -carotenoid; Chl -chlorophyll; D -fraction of light absorbed in PSII antennae that is dissipated thermally; DM -dry mass; ETR -electron transfer rate; Ex -fraction of light absorbed in PSII antennae that is neither utilized in photosynthetic electron transport nor dissipated thermally; F0 -minimal fluorescence yield of the dark-adapted state; F0' -minimal fluorescence yield of the light-adapted state; FM -fresh mass; Fm -maximal fluorescence yield in the dark-adapted state; Fm' -maximal fluorescence yield in the light-adapted state; Fv'/Fm' -the efficiency of excitation capture of open PSII center; GF -green film; LCP -light-compensation point; LSP -light-saturation point; NPQ -nonphotochemical quenching coefficient; OA -oleanolic acid; P -fraction of light absorbed in PSII antennae that is utilized in PSII photochemistry; PNmax -lightsaturated net photosynthetic rate; qP -photochemical quenching coefficient; R/B -ratio of red light and blue light; RD -dark respiration rate; RF -red film; R/FR -ratio of red light to far-red light; UA -ursolic acid; WF -white film; YF -yellow film; Yield -quantum photochemical yield; ΦPSII -effective quantum yield of PSII photochemistry.