Abstract: The long adaptations of Dioscorea zingiberensis type low-light intensity to 10,55,100 and 270  μmol·m^-2·s^-1 light were tested.The results showed that the fluorescence spectrum was different as the growth light was different.In dark growth light (10 and 55  μmol·m^-2·s^-1),the spectra of the D.zingiberensis type low-light intensity had not F595 and F740 fluorescence peaks (in 55  μmol·m^-2·s^-1 had F740 shoulder peak),but had the F720 main peaks.The energy were mainly distributed to photosystem II.Dark adaptation changed the function of LHCII and CP43.Red light of 670 nm and 716 nm induced for 15 min decreased the energy distributed to photosystem II.The stacking index of chloroplast was larger than those in the higher growth light (100 and 270  μmol·m^-2·s^-1),but the starch grain was smaller.In the higher growth light (100 and 270  μmol·m^-2·s^-1),the spectra of the D.zingiberensis type low-light intensity had not F720,but the F740 main peaks were stronger.The excited energy of photosystem II was stronger.Dark adaptation increased the energy transferring efficiency from LHCI to PSI-RC.Red light of 670 nm and 716 nm induced for 15 min increased the energy distributed to photosystem II.The stacking index of chloroplast was smaller,but the starch grain was larger.

Key words: light, Dioscorea zingiberensis type low-light intensity, 77 K fluorescence spectra, chloroplast structure