Abstract
IT has been shown by Wilkins1,2 that if excised leaves of the succulent plant B. fedtschenkoi are maintained in darkness, at a constant temperature of 26° C. and in an air-stream initially free of carbon dioxide they exhibit a 22.4-hr. rhythm in their rate of output of carbon dioxide. Furthermore, it was found that continuous illumination inhibited the rhythm, which recommenced when darkness was restored. A more detailed investigation of the light inhibition of the rhythm has been made by illuminating leaves for a few hours at various positions in the cycle.
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References
Wilkins, M. B., Ph.D. thesis, University of London (1958).
Wilkins, M. B., J. Exp. Bot., 10, 377 (1959).
Hastings, J. W., and Sweeney, B. M., Biol. Bull., 115, 440 (1958).
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WILKINS, M. Effects of Light and Darkness on the Rhythm of Output of Carbon Dioxide of Excised Bryophyllum Leaves. Nature 187, 523–525 (1960). https://doi.org/10.1038/187523a0
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DOI: https://doi.org/10.1038/187523a0
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