The effects of light and low temperature on chlorophyll fluorescence kinetics parameters of tea leaves

In order to reveal the effects of low temperature and light on tea photoinhibition,changes of chlorophyll fluorescence kinetics parameters in tea seedings were studied under conditions at temperature(0,5,10,15,25℃,25℃ as the CK) and light(3,4,6,10,15.5 klx)using illumination incubator.The results show that the chlorophyll fluorescence kinetics parameters of tea leaves maintained stable level at 25 ℃ under the light from 3 klx to 15.5 klx,but Fm,Fv/Fo,qP,ΦPSII,Fv′/Fm′ decreased and Fo,qN increased when the temperature decreased from 15℃ to 0℃.Change in chlorophyll fluorescence kinetics parameters was great under lower temperature and stronger light.It indicates that photoinhibition happened in tea leaves at lower temperature.