Abstract
The fluorescence of chlorophyll a and C-705 in green leaves has been investigated during the induction period of photosynthesis in air and in nitrogen. A brief illumination of a leaf with red light causes an increased yield of chlorophyll a fluorescence which persists for a longer period in nitrogen than air. The increased fluorescence yield, produced by red light, can be inhibited by a subsequent irradiation with far-red light. The action spectrum for the effect of far-red light shows a maximum near 705 mμ. The effects of red and far-red light on the fluorescence yield of chlorophyll a are thought to be another manifestation of the second Emerson effect.
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