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      The effects of lead stress on photosynthetic function and chloroplast ultrastructure of Robinia pseudoacacia seedlings.

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          Abstract

          In this experiment, the effects of different lead (Pb) concentrations (0, 200, 600, 1000, 1400 mg kg-1) on photosynthesis and chlorophyll fluorescence in Robinia pseudoacacia seedlings were examined. As Pb concentration increased, chlorophyll a, chlorophyll b, total chlorophyll content, net photosynthetic rate, transpiration rate, stomatal conductance (g s), and mesophyll intercellular carbon dioxide concentration were gradually reduced. Maximal photochemical efficiency, photochemical quenching, and quantum yield also decreased. However, the initial fluorescence and nonphotochemical quenching gradually increased. Chloroplasts swelled owing to local plasmolysis and lost most of their starch content, and their thylakoid lamellae gradually became disordered and loosely packed. When the chloroplast envelope was lost under high Pb stress (≥1000 mg kg-1), lipid globules were released into the surrounding mesophyll cell. Multiple regression analysis showed that g s and inactivity of the PSII reaction center had the greatest effect on photosynthetic function, whereas inhibition of electron transport had minimal effects on black locust seedlings under Pb stress.

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          Author and article information

          Journal
          Environ Sci Pollut Res Int
          Environmental science and pollution research international
          Springer Nature America, Inc
          1614-7499
          0944-1344
          Apr 2017
          : 24
          : 11
          Affiliations
          [1 ] School of Horticulture and Landscape Architecture, Institute of Science and Technology of Henan, Xinxiang, Henan, 453003, China.
          [2 ] Research Institute of Forestry Chinese Academy of Forestry, Beijing, 100091, China.
          [3 ] Research Institute of Forestry Chinese Academy of Forestry, Beijing, 100091, China. m13525059684@163.com.
          Article
          10.1007/s11356-017-8713-2
          10.1007/s11356-017-8713-2
          28283981
          ad48ce73-c588-48dd-a117-08c98b13b4a5
          History

          Ultrastructure,Photosynthesis,Lead stress,Fluorescence,Chlorophyll,Character

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