Chlorophyll Fluorescence Characteristics and Their Relatiionship with Grain Yield,Stach Acumulation of Wheat with Different Quality

In order to understand the chlorophyll fluorescence characteristics of wheat cultivars with different quality at grain filling stage ,Yumai 50,Zhengmai 9023 and Wenmai 4 were adopted in this experiment.In the field condition,the changes of LAI,chlorophyll content and chlorophyll fluorescence kinetics parameters in flag leaf were investigated after anthesis. The potential photochemical efficiency of PSⅡ(Fv/Fo),maximal photochemical efficiency of PSⅡ in the darkness(Fv/Fm),actual photochemical efficiency of PSⅡin the light(Ф_(PSⅡ)) and chemical quenching coefficient(qP)declined during the grain filling stage,but the non-photochemical quenching coefficient(qN) increased.At the same stage after anthesis Yumai 50 had the highest LAI,chlorophyll content,Fv/Fo,Fv/Fm,Ф_(PSⅡ) and qP.The highest qN indicated that the photoinhibition degree was highest in Yumai 50 among these three wheat cultivars.The yield,starch content and starch yield in Yumai 50 were highest,and were lowest in Zhengmai 9023.The yield,starch content and starch yield were significantly correlated to Fv/Fo,Fv/Fm,Φ_(PSⅡ) and qP at flowering stage,early grain filling stage and later grain filling stage and qN in intermediate grain filling stage.