Effects of nitrogen forms on photosynthetic pigment and chlorophyll fluorescence characteristics of potato leaves

To study the effects of different nitrogen forms on the Photosynthetic characteristics of potato leaves,the photosynthetic pigment contents in leaves at different growth stages were analyzed,and the relationships between chlorophyll fluorescence kinetics parameters and photosynthetic pigment contents were discussed.The results showed that their effects on contents of chlorophyll a,chlorophyll b and carotenoids in leaves were significant during tuber formation stage.However,their effect on the content ratio of chlorophyll a/b was not obvious,and there was no significant difference among different treatments from seedling stage to tuber formation stage.In addition,the regression models of PSⅡ photochemical efficiency and potential activity based on the contents of chlorophyll a,chlorophyll b and carotenoids have higher accuracy,and the determination coefficient of model in each growth stage was higher than 0.865.Thus they can be used to describe the relationship between chlorophyll fluorescence kinetics parameters and photosynthetic pigment contents in leaves.The results provide a scientific basis for nitrogen management in potato.