Effects of Pesticides Stress on the Chlorophyll Fluorescence Characteristics and Growth of Vernicia fordii Seedlings

[Objective] In this study,the chlorophyll fluorescence characteristics and growth of Vernicia fordii( tung-oil) seedlings under pesticides stress were analyzed in order to guide tung oil cultivation and provide theoretical references for reducing non- point source pollution in the Three Gorges Reservoir Area. [Method] A pot experiment was conducted to study and compare the chlorophyll contents,chlorophyll fluorescence and growth of tung-oil seedlings under different concentrations of paraquat and fenvalerate-dimerthoate. Levels of paraquat and fenvalerate-dimerthoate were technical /water = 1 /50,1 /100,1 /200,1 /400 and 1 /800 and technical / water = 1 /125,1 /250,1 /500,1 /1 000 and 1 /2 000,respectively. Water treatment served as control. [Results] Results showed that the chlorophyll content differed under different concentrations of paraquat and fenvalerate-dimerthoate and the chlorophyll content decreased with increasing concentration. These differences were significant in the high concentrations treatme