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Study on characteristic of chlorophyll a fluorescence kinetics of overwintering Euonymus japonicus in Beijing

ZHONG Chuan-fei1,GAO Zhi-kui2,LI Wei3,GAO Rong-fu1(1.College of Biological Sciences and Biotechnology,Beijing Forestry University,Beijing 100083,China;2.College of Horticulture,Agriculture University of Hebei,Baoding 071000,China;3.State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)  
Chlorophyll a fluorescence kinetics and photosynthesis rate of overwintering Euonmymus japonicus in Beijing public gardens were investigated with PAM2100 and OXYLAB.The acclimation mechanism of Photosystem Ⅱ(PSⅡ) was discussed.With the onset of winter,both photochemichal rate of PSⅡ and photosynthetic rate decreased gradually,and the decrease of sun leaves were greater than that of shade leaves.In winter,kinetics of chlorophyll a fluorescence induction curves of sun leaves disappeared,while that of shade leaves still exists.On the other hand,several mechanisms combined to effectively protect the photosynthetic apparatus from photodamage in winter.Firstly,the fact that both minimal fluorescence(Fo) and max photochemical rate of PSⅡ(FV/Fm) decreased indicated that the plant reduced excitons of PSⅡ through cutting the size of light-harvesting antenna.Secondly,results of photochemical quench(qP) suggested that excitons of PSⅡ donor side could be absorbed by keeping open of PSⅡ.Furthermore,both nonlinear electron transport rate and energy dissipation other than antenna were important photoprotective ways for overwintering Euonmymus japonicus.
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