SOME FACTORS INFLUENCING THE LONG-WAVE LIMIT OF PHOTOSYNTHESIS

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Abstract
The sharp decline in efficiency of photosynthesis beginning at or near 685 m[mu] requires interpretation. A decline in yield of fluorescence on the long-wave side of an absorption band, known for chlorophyll as well as for many other dye molecules, poses a similar problem. The authors report, for both Chlorella pyrenoidosa and the red alga Porphyridium cruentum, that at lower temperatures the decline in yield of photosynthesis begins at longer wave lengths and that in the region of long-wave decline the yield could be improved by supplementary light of shorter wave lengths. Additional experiments with Chlorella are reported which confirm these effects of temperature and supplementary light in greater detail.

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