Photosystem with fluorescence parameters

Although p (J) values are slightly smaller than pI q s obtained for the Hill reaction, they remain very similar except for ioxynil. Generally speaking, quantitative measurements of the fluorescence parameters described herein showed that DCMU-type inhibitors disconnect the two photosystems progressively as concentrations of the inhibitors are increased. Ioxynil does not behave in this manner. Ioxynil may not interfere at exactly the same site as the DCMU-type inhibitors, or it may have a secondary point of interference with the photosynthetic electron transport chain. 

To evaluate the photosystem 2 (PS2) activity the parameters Fg and Fy of prompt fluorescence induction kinetics of leaf discs and isolated chloroplasts were measured with chlorophyll fluorescence measuring system, PAM (15). The chloroplasts were diluted with 10 mM Tricine buffer, pH 7.8, containing 330 mM sorbitol, 5 mM MgSOd and 1.6 mM of corresponding PA to 60 pg/ml. The leaf discs were incubated 1h in... 

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