Study on the Relationship of Chlorophyll Fluorescence Characters and Drought Resistance of Winter Wheat Varieties under Drought Stress

In order to study the drought characters in photosynthesis of different ecological type wheat varieties, the photosynthesis characteristic of the different ecological type wheat varieties under drought stress was studied by measuring the chlorophyll fluorescence dynamic parameters. The results indicated that Fm、Fv、Fv/Fm and Fv/Fo values decreased gradually, but Fo values increased under drought stress; The variable range depended on the ecological type.The variation of these chlorophyll fluorescence parameters was closely related to drought tolerance of wheat varieties.It was possible to determine the drought resistance in wheat using chlorophyll fluorescence characters.