Effects of H_2O_2 on Chlorophyll Cluorescenceo and Chlorophyll in Wheat

[Objective] To study the effects of different concentration H2O2 treatments on chlorophyll fluorescenceo and chlorophyll of seedlings of two kinds of wheat.[Method]With Ningchun 4 and Xihan 2 seedlings as material,hydroponic experiment was conducted.[Result] F0,Fm,Y(NPQ),Photochemical quenching(qP),Nonphotochemical quenching(NPQ) significantly decreased under 200μmol/L H2O2 treatment in comparison with the control.but remarkable reductions in Chla,chlorophyllb and total chlorophyll was observed in Ningchun under different H2O2 concentration.50,100 and 200μmol/L H2O2 resulted in decreased chlorophyll a content,F0 was observed decreased to different H2O2 concentration,there was an increase of Fv/Fm,Y(Π),ETR,qP and NPQ in response to different H2O2 concentration as compared with untreated wheat,while no significant changes in chlorophyll b and total chlorophyll.[Conclusion] Exogenous H2O2 treatment resulted PSⅡ reaction system more open,and photosynthetic apparatus were damaged more in the mine population in Xihan 2 seedlings,in comparison with Ningchun 4 seedlings.