Abstract
THE fact that riboflavin and eosin, which are known to determine the photo-inactivation of indoleacetic acid2,3, are both fluorescent, led us to investigate whether other fluorescent substances would also be effective in sensitizing such a reaction. Quinine sulphate, æsculin and 2,3,5-triphenyl tetrazolium chloride were tested. It was found by both chemical and biological experiments that these compounds were all active. These substances are colourless, but fluoresce with a visible colour, absorbing light in the ultra-violet region. They are not related chemically, fluorescence being apparently the only property common to them. The present experiments do not necessarily show that there is a direct cause-and-effect relationship between fluorescence and the capacity of inducing the photo-inactivation of indoleacetic acid.
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References
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Galston, A. W., Proc. U.S. Nat. Acad. Sci., 35 (1949).
Skoog, F., J. Cell. and Comp. Physiol., 7 (1935).
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FERRI, M. Photo-inactivation of the Plant Hormone Indoleacetic Acid by Fluorescent Substances. Nature 168, 334–335 (1951). https://doi.org/10.1038/168334a0
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DOI: https://doi.org/10.1038/168334a0
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