Modulated chlorophyll fluorescence induction kinetics was used to investigate the effects of altered water conditions on the photosynthetic functions of flag leaves of different winter wheat varieties.The photosynthetic functions include many chlorophyll fluorescence parameters such as minimal fluorescence(Fo),maximal fluorescence(Fm) and the ratio of the variable fluorescence to maximal fluorescence Fv/Fm,the potential activities of PS Ⅱ(Fv/Fo),photochemical quenching(qP) and non-photochemical quenching(qN...
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