Abstract
The intrinsic fluorescence yield of pigments in vivo and the energy-transfer efficiency (to sensitize chlorophyll fluorescence) are not constant but can be modified by irradiating the algae with monochromatic light for short periods of time. When cells are grown in blue light (436 mμ), adapting them to green light (546 mμ) increases the efficiency with which the phycoerythrin sensitizes chlorophyll fluorescence; adapting them to intense blue light (436 mμ) decreases the efficiency with which phycoerythrin sensitizes chlorophyll fluorescence. Interpreting the effects of adaptation on cells cultured in green light (546 mμ) required the assumption that two types of chlorophyll (fluorescent and nonfluorescent) exist in vivo and that the efficiency of energy transfer between these two forms can be changed by adaptation. The other observed adaptation effects can also be explained by this assumption.
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