Effects of Environment Factor on Chlorophyll Fluorescence Parameters on Maize

Effects of different light time,light intensity,CO2 consistence and water level were studied on the chlorophyll fluorescence parameters of leaves in maize.The Fluorescence kinetic curve show that with the lighting prolonged,chlorophyll fluorescence presented the ETR,qP and NPQ that gradually rose and kept stable after 20 minutes illumination in synchronization with it photosynthesis.Fluorescence light curve show that with the lighting strengthen,its PhiPS Ⅱ and light intensity appeared linearly and negatively correlated.Its PhiCO2 and light intensity appeared linearly and negatively correlated when the light intensity surpassed 500 μmol/(m2 · s)extension.PhiCO2 and light intensity appeared linearly and positively correlated when the light intensity less then 500 μmol/(m2 · s)extension.ACI curve show that its photosynthetic rate,PhiPS Ⅱ and PhiCO2 and ETR value have a positive relation to carbon dioxide concentration in a certain extent.The value of Fm,Fv/Fm,PhiPS Ⅱ,PhiCO2 and ETR were decreased under the anabatic water stress.But the Fo and NPQ value were increased with the deepening water stress.Analysis indicated that photosystemⅡ was damaged,and heat disseminate was increased to defend strong light damage.Light suppress phenomena was emerged in diurnal variation of Fv/Fm.Suppress degree was increased and the ordinary level time was prolonged under water stress.