EXPERIMENTS ON THE EFFECTS OF COMBINED WAVELENGTHS ON PHOTOSYNTHESIS.
Technical (final) rept.,
TECHNISCHE HOCHSCHULE MUNICH (WEST GERMANY)
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The apparatuses were constructed, of which each allows the projection of two monochromatic beams of a high light intensity on the same area of an algae suspension. One device is based on monochromators which are equipped with gratings, the other consists of projectors with interference filters. A suitable cuvette was constructed to expose an algae suspension to the beams, while they are supplied with an air-CO2 mixture at a constant rate of flow and kept at constant temperaturee. Photosynthesis is measured by the increase of radioactivity, which is taken up from C14O2. Experiments to elucidate the optimal conditions for photosynthesis under our special arrangments are described. Preliminary experiments with combined wavelengths showed the following results If blue light is added to red light, there is a decrease in photosynthesis of about 20 below the value obtained by the addition of photosynthesis with the single light beams. If far red light is added to red light a remarkable increase of 20 to 80 is observed. Author