Abstract
The redox potentials of the chloroplast cytochromes b-559 and b-563 have been measured in situ using a dual wavelength spectrophotometer. Titrations were performed anaerobically with the absorbance and potential changes being recorded simultaneously. The oxidation-reduction of the b cytochromes is described by a one-electron transition for each component, with the midpoint potentials being −180 ±20mV for the cytochrome b-563 and +80 ±20mV for the cytochrome b-559 at pH 7.0. The redox potential of the cytochrome b-559, but not the cytochrome b-563, seems to be pH dependent, with the midpoint of the cytochrome b-559 being +40 mV at pH 8.0 and approx. +120 mV at pH 6.0. The redox potential of cytochrome f in situ is found to be +340 ±10mV at pH 8.0.
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