Effects of Light and Darkness on the Rhythm of Output of Carbon Dioxide of Excised Bryophyllum Leaves

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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

  1. 1

    Wilkins, M. B., Ph.D. thesis, University of London (1958).

  2. 2

    Wilkins, M. B., J. Exp. Bot., 10, 377 (1959).

  3. 3

    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) doi:10.1038/187523a0

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