Effects Of Doubled Atmospheric CO₂Concentration On Photosynthesis Product Allocation And Fruit Quality In Lycium Barbarum

Taking Lycium Barbarum L.seedlings as research material, and using open-top chamber to control CO2concentration, the paper studied the changes of the biomass, photosynthesis product allocation and sucrose-metabolizing enzymes in fruit of Lycium Barbarum to analyze photosynthesis product allocation, and content of effective components in Lycium Barbarum under doubled atmospheric CO2concentrations. The study results as follows:The leave growth of L. Barbarum was increased significantly under doubled atmospheric CO2concentration, but height growth, root-collar diameter, the length and diameter of new shots of L.Barbarum were slightly increased, but no significant difference with control group. The treatment of doubled atmospheric CO2concentration increased the root biomass and reduced the leaf biomass in L.Barbarum, which maens mor photosynthesis product allocated to root.The doubled atmospheric CO2concentration treatments reduced net photosynthetic rate and transpiration rate of L. Barbarum significantly, but increased intercellular CO2concentration, water use efficiency and stomatal conductance.Doubled atmospheric CO2concentration treatment increased root of sucrose and starch content, but reduced the content of fructose in leaf, starch and sucrose of the fruit significantly. Moreover, the treatment increased the content of starch in fruit significantly, no significant effect on the content of sugar in stem. The treatment of doubled atmospheric CO2concentration had an inhibition on invertase activities of L. Barbarum.The treatment of doubled atmospheric CO2concentration reduced the content of polysaccharide and total sugar content, and the contents of taurine, flavone, carotenoid which are some active components of the fruit in L. Barbarum. All these indicated that doubled atmospheric CO2concentration treatment affected fruit quality of L. Barbarum.