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Slow fluorescence induction (SFI) in bean and wheat leaves was observed under illumination by wide-band blue light after 5 min dark period. The FM FT ratio was used as a main parameter of SFI. where F M is a maximal, and F T is a steady-state level of fluorescence. Leaves were treated by various chemical agents: herbicide diuron, activator of photosynthesis, inorganic phosphate, and...