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Annals of Botany 72: 129-131, 1993
© 1993 Annals of Botany Company

Reduction of Respiration by High Ambient CO2 and the Resulting Error in Measurements of Respiration Made with O2 Electrodes

J. Reuveni, J. Gale and A. M. Mayer

Department of Botany, Hebrew University of Jerusalem, Jerusalem, 91904, Israel

Respiration rates of Lemna gibba fronds and Orobanche aegyptiaca and Lactuca sativa seedlings, were measured with a Clark type oxygen electrode in the presence or absence of a carbon-dioxide absorber (KOH) in the gas phase. Measured respiration rates in the presence of KOH were 17-34% higher than in its absence. The suppression of respiration by high CO2 concentrations, [CO2], was confirmed by parallel studies of CO2 efflux, made by infrared gas spectrometry. These results are consistent with other reports of reduced rates of respiration at high [CO2].

Measurements of respiration quotients of Lemna and Lactuca were made at 0 and 100 Pa [CO2]. Results did not support the possibility of induced dark fixation of CO2 at the ambient atmospheric [CO2] predicted for the next century (35-100 Pa).

It is concluded that the numerous reports of respiration measurements made with O2 electrodes, in the absence of a CO2 absorber, may contain a significant errorCopyright 1993, 1999 Academic Press

Lemna gibba, Lactuca sativa, Orobanche aegyptiaca, CO2 accumulation, O2 electrode, respiration, dark CO2 fixation, respiration quotient, atmospheric CO2


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