The Effect of Prolonged Shading on the Light Saturation Curves of Apparent Photosynthesis in Sun Plants.

Abstract
The rate of apparent photosynthesis in relation to light intensity was measured in leaves of 7 species. Measurements were performed on plants of each species which had developed in the greenhouse, in full sunlight or at 100 to 700 foot-candles. All species had been determined previously as having the typical light curves of sun plants when growing under conditions similar to those of their natural habitat. With 1 exception leaves of the shade-grown plants were light saturated at a light intensity at 1000 foot-candles lower than those of the sun plants. The compensation points of the shade plants, with 1 exception, were lowered by 0 to 100 foot-candles from those of the sun plants.

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