Effect of inorganic phosphate on photosynthesis in bean leaves

It was shown that raising pod seedlings by the hydroponics method on KH2PO4 solutions at concentrations between 10(-7) and 10(-5) M leads to an increase in the rate of oxygen release (delta O2/delta t), with the chlorophyll content in leaves being unchanged. The values of the parameters FM/FT of slow fluorescence induction and B/A of photoinduced changes in ESR1 signals from pod leaves correlate with the delta O2/delta t value.