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Using the alga Chlorella and 2 light beams of defined wavelength, we have found that short period (1 sec) alternation gives all characteristics of enhancement of net oxygen evolution observed when the beams are superimposed. With increasing period of alternation (1-20 see) decay in enhancement is more rapid at higher intensities. We have developed a kinetic model for the current hypothesis of 2 photoacts operating in series and separated by electron transport reactions. The model is applicable at low light intensity such that rate is governed only by intensities and the fractions of reaction centers open for each photoact. Potentials and pool sizes of intermediates were taken from current estimates. Wavelength dependency of the 2 photoacts was taken from enhancement spectra for superimposed light beams. Analog computer treatment of the kinetic equations gave predictions of chromatic transients and alternated enhancement which are in reasonable but not complete agreement with experimental observations.

Enhancement of Photosynthesis by Alternated Light Beams and a Kinetic Model