AOBPreview originally published online on March 29, 2004
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Annals of Botany 93: 665-669, 2004
© 2004 Annals of Botany Company
A Comparison of the Effects of Carbon Dioxide Concentration and Temperature on Respiration, Translocation and Nitrate Reduction in Darkened Soybean Leaves
1 ACSL, Plant Science Institute, Beltsville Agricultural Research Center, Beltsville, MD, USA
* For correspondence. E-mail buncej{at}ba.ars.usda.gov
Received: 15 December 2003; Returned for revision: 29 January 2004; Accepted: 10 February 2004; Published electronically: 29 March 2004
• Background and aims Respiration of autotrophs is an important component of their carbon balance as well as the global carbon dioxide budget. How autotrophic respiration may respond to increasing carbon dioxide concentrations, [CO2], in the atmosphere remains uncertain. The existence of short-term responses of respiration rates of plant leaves to [CO2] is controversial. Short-term responses of respiration to temperature are not disputed. This work compared responses of dark respiration and two processes dependent on the energy and reductant supplied by dark respiration, translocation and nitrate reduction, to changes in [CO2] and temperature.
• Methods Mature soybean leaves were exposed for a single 8-h dark period to one of five combinations of air temperature and [CO2], and rates of respiration, translocation and nitrate reduction were determined for each treatment.
• Key results Low temperature and elevated [CO2] reduced rates of respiration, translocation and nitrate reduction, while increased temperature and low [CO2] increased rates of all three processes. A given change in the rate of respiration was accompanied by the same change in the rate of translocation or nitrate reduction, regardless of whether the altered respiration was caused by a change in temperature or by a change in [CO2].
• Conclusions These results make it highly unlikely that the observed responses of respiration rate to [CO2] were artefacts due to errors in the measurement of carbon dioxide exchange rates in this case, and indicate that elevated [CO2] at night can affect translocation and nitrate reduction through its effect on respiration.
Key words: carbon dioxide, temperature, respiration, translocation, nitrate reduction, Glycine max.
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