土壤水分对越冬期间冬小麦叶绿素荧光参数的影响

采用两个抗寒性不同的冬小麦品种为试验材料,设置了土壤绝对含水量15%±2%、30%±2%、45%±2%和对照(35%～40%,CK)正常管理等4个水分处理,6个取样时期,对越冬期冬小麦叶片的叶绿素荧光参数,Fo(初始荧光)、Fm(最大荧光)、Fv/Fm(最大量子产量)、Yield(实际量子产量)进行了测定.结果表明.品...

Effect of soil moisture on chlorophyll fluorescence parameters before frozen period in winter wheat(Triticum aestivum L.)

Two winter wheat cultivars which differed in the freezing tolerance were planted in four soil moisture treatments(soil water content:15%±2%,30%±2%,45%±2% and normal(35%-40%)).The chlorophyll fluorescence parameters(i.e.Fo,Fm,Fv/Fm,Yield) of leaves of winter wheat were measured in six sampling stages of winter.The results showed that comparison between two cultivars showed that Fm,Fv/Fm and Yield of the freezing tolerant cultivar DN1 were higher significantly than those of the cold sensitive cultivar Jimai22 into the frozen stage.Fv/Fm,yield of the two cultivars in normal soil moisture was higher than other water treatments at freezing stage.The Fm value of two cultivars was higher after 20 d since frozen stage.It conclued that Fv/Fm and yield after frozen stage could be used as the indices for evaluating weak or strong in photosynthetic features of winter wheat cultivars under cold temperature.The strong photosynthetic activities in winter wheat leaves under low temperature could be maintained in the soil moisture of 35%-40% before frozen stage.