Range of photosynthetic control of postillumination P700+ reduction rate in sunflower leaves

  title={Range of photosynthetic control of postillumination P700+ reduction rate in sunflower leaves},
  author={Agu Laisk and Vello Oja},
  journal={Photosynthesis Research},
The kinetics of the postillumination reduction of P700+ which reflects the rate constant for plastoquinol (PQH2) oxidation was recorded in sunflower leaves at different photon absorption densities (PAD), CO2 and O2 concentrations. The P700 oxidation state was calculated from the leaf transmittance at 830 nm logged at 50 μs intervals. The P700+ dark reduction kinetics were fitted with two exponents with time constants of 6.5 and about 45 ms at atmospheric CO2 and O2 concentrations. The time… CONTINUE READING


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