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Journal List > Plant Physiol > v.41(3); Mar 1966

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Plant Physiol. 1966 March; 41(3): 422–427.
PMCID: PMC1086359
Copyright notice
Effect of Oxygen on Photosynthesis, Photorespiration and Respiration in Detached Leaves. I. Soybean 1
Marlene L. Forrester,2 G. Krotkov, and C. D. Nelson3
Department of Biology, Queen's University, Kingston, Ontario
2 Present address: Waite Agricultural Research Institute, Private Mail Bag No. 1, Glen Osmond, S. Australia.
3 Present address: Department of Biological Sciences, Simon Fraser University, Burnaby, B. C.
1 The financial support for this work came from the National Research Council of Canada.
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Abstract
The effect of O2 on the CO2 exchange of detached soybean leaves was measured with a Clark oxygen electrode and infrared carbon dioxide analysers in both open and closed systems.
The rate of apparent photosynthesis was inhibited by O2 while the steady rate of respiration after a few minutes in the dark was not affected. Part of the inhibition of apparent photosynthesis was shown to be a result of increased photorespiration. This stimulation of photorespiration by O2 was manifested by an increase in the CO2 compensation point.
The differential effects of O2 on dark respiration (no effect) and photorespiration (stimulation) indicated that these were 2 different processes.
Moreover the extrapolation of the CO2 compensation point to zero at zero O2 indicated that dark respiration was suppressed in the light at least at zero O2 concentration.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
  • HOCH G, OWENS OV, KOK B. Photosynthesis and respiration. Arch Biochem Biophys. 1963 Apr;101:171–180. [PubMed]
  • Ozbun JL, Volk RJ, Jackson WA. Effects of Light and Darkness on Gaseous Exchange of Bean Leaves. Plant Physiol. 1964 Jul;39(4):523–527. [PubMed]
  • TURNER JS, BRITTAIN EG. Oxygen as a factor in photosynthesis. Biol Rev Camb Philos Soc. 1962 Feb;37:130–170. [PubMed]
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