Effects of Illuminance near and below light Saturation on the Time Course of Photosynthesis in Synchronized Cultures of Algae

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Abstract
The effect of light intensity on the rate of the photosynthetic gas exchange was studied in synchronized suspensions of the high-temperature strain, Chlorella 7-11-05. It was found that, contrary to previous investigations, even the light intensity far below light saturation can be harmful to the photosynthetic activity of algal cells. The ability of cells to withstand the inhibitory effects of light and to use increasing light intensity efficiently depends largely on the developmental status of the cells. Studies on the effects of light on non-synchronized populations may produce misleading results because statistical averages of the illuminance characteristics of cells of different developmental stages may cancel and largely obscure the inherent physiological characteristics of the individual cells.

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