Initial fluorescence (F0), maximal fluorescence (Fm), the maximum photochemical efficiency of PSII (Fv/Fm), photochemical (qP) and nonphotochemical (qN) quenching of
chlorophyll fluorescence in DP-jasmine responded to different levels of irradiance. The values represented mean SE, and different letters mark significant differences among
shade treatments on the same day (P < 0.05).