ABSTRACT
The effect of increasing the intensity of white growth light was to diminish both biliprotein and chlorophyll, and this change in the content for both types of photosynthetic pigments can readily occur in the absence of a variation in pigment ratio. Brody and Emerson found that cells of P. cruentum grown in green light had a higher quantum yield for photosynthesis in green light than did cells grown in blue light. Likewise, cells grown in blue light had a higher quantum yield for photosynthesis in these wavelengths than cells grown in green light. Chromatic adaptation in the cyanobacterium Tolypothrix tenuis has been studied extensively. This organism is the type in which light regulated both C-phycoerythrin and C-phycocyanin syntheses. Biliprotein-containing organisms live in a plethora of habitats. They are abundant in oceans, intertidal zones, fresh water and terrestrial regions and also flourish in water which have extremes of pH, salinity, or temperature.
