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Journal of Experimental Botany, Vol. 52, No. 364, pp. 2235-2238, November 1, 2001
© 2001 Oxford University Press

Short Communication

Leaf O2 uptake in the dark is independent of coincident CO2 partial pressure

Jeffrey S. Amthor1,4, George W. Koch2, Jennifer R. Willms3,5 and David B. Layzell3

1 Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
2 Department of Biological Sciences and the Merriam-Powell Center for Environmental Research, Box 5640, Northern Arizona University, Flagstaff, Arizona 86011, USA
3 Department of Biology, Queen's University at Kingston, Kingston, Ontario K7L 3N6, Canada

Abstract

Elevated CO2, in the dark, is sometimes reported to inhibit leaf respiration, with respiration usually measured as CO2 efflux. Oxygen uptake may be a better gauge of respiration because non-respiratory processes can affect dark CO2 efflux in elevated CO2. Two methods of quantifying O2 uptake indicated that leaf respiration was unaffected by coincident CO2 level in the dark.

Key words: Carbon dioxide, oxygen, respiration, Rumex crispus.


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