【摘要】 经浓度低于8mmol·L-1的NaHSO3溶液处理的脐橙叶片净光合速率(Pn)、电子传递速率ETR和叶绿体光合放O2活性升高,光合色素含量、初始荧光Fo和PS 的光化学效率Fv/Fm变化不明显;而12mmol·L-1的NaHSO3溶液处理后,Pn、光合色素含量、Fv/Fm、ETR和光合放O2活性显著下降,Fo则明显升高。与对照相比,处理组叶绿体内·O2-、H2O2的含量显著降低。结果显示,低浓度NaHSO3溶液能通过清除·O2-、H2O2等有害物质而促进光合作用。高浓度NaHSO3溶液因过量的HSO3-以及由它产生的SO2均具有漂白作用,最终导致脐橙发生光合作用的光抑制。更多还原

【Abstract】 The net photosynthetic rate（Pn）, electron transfer rate（ETR） in leavesof umbilical orange and photosynthetic O₂ evolution activities of the chloroplastsgo up after treatment by under 8 mmol·L^-1 sodium bisulfite solution,and photosyntheticpigment content, initial fluorescence（Fo） and photochemical efficiency of PSⅡ （Fv/Fm）change unsignally. The Pn , photosynthetic pigment content , Fv/Fm,ETR and photosynthetic O₂ evolution activities of the chloroplasts marked decrease and Fo increase after deal with sodium bisulfite of 12 mmol·L^-1 concentrations . After treated by sodium bisulfite solution, the content of·O₂^- and H₂O₂ in the chloroplastswas much lower than control（H2O）.The results indicated that sodium bisulfite at low concentrations could increase photosynthetic rate by to rid ·O₂^-?H₂O₂ etc. baneful substance.And that sodium bisulfite at high concentrations,because superfluous HSO₃^- along with by it procreant SO₂ all have blanch action,finally conducing the umbilical orange take place photoinhibition of photosynthesis.更多还原