Abstract
IT was recently found by Gabrielsen1 that leaves of elder (Sambucus nigra), enclosed either in ordinary air of 0.03 per cent carbon dioxide content or air poor in carbon dioxide (0.0024 per cent) and illuminated with light of 1,100 foot-candles intensity, brought the carbon dioxide content to a constant value of about 0·009 per cent. He has suggested1,2 that this 0·009 per cent represents a threshold value below which no photosynthesis can take place. Audus· found that even at high light intensities leafy shoofs of cherry laurel gave out carbon dioxide into a srfow stream of carbon dioxide - free air, although F. F. Blackman4 and Maskell5 had found no detectable quantity of carbon dioxide emitted by illuminated leaves under such conditions.
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References
Gabrielsen, E. K., Nature, 161, 138 (1948).
Gabrielsen, E. K., Nature, 163, 359 (1949).
Audus, L. J., Ann. Bot., 11, 165 (1947).
Blackman, F. F., Phil. Trans. Roy. Soc., B, 186, 503 (1895).
Maskell, E. J., Proc. Roy. Soc., B, 102, 467 (1928).
Heath, O. V. S., Ann. Bot., 3, 469 (1939).
Gregory, F. G., and Pearse, H. L., Proc. Roy. Soc., B, 114, 477 (1934).
Heath, O. V. S., Ann. Bot., 5, 455 (1941).
Heath, O. V. S., Nature, 161, 178 (1948).
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Heath, O. Carbon Dioxide in the intercellular Spaces of Leaves During Photosynthesis. Nature 164, 822–823 (1949). https://doi.org/10.1038/164822a0
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DOI: https://doi.org/10.1038/164822a0
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