AOBPreview originally published online on August 5, 2002
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Annals of Botany 90: 399-403, 2002
© 2002 Annals of Botany Company
Carbon Dioxide Concentration at Night Affects Translocation from Soybean Leaves
1 ACSL, Plant Science Institute, USDA-ARS, Beltsville Agricultural Research Center, 10300 Baltimore Ave, Beltsville MD 20705-2350, USA
* For correspondence. E-mail buncej{at}ba.ars.usda.gov
Received: 4 March 2002; Returned for revision: 20 May 2002; Accepted: 17 June 2002 Published electronically: 5 August 2002
Studies have indicated that the concentration of carbon dioxide [CO2] during the dark period may influence plant dry matter accumulation. It is often suggested that these effects on growth result from effects of [CO2] on rates of respiration, but responses of respiration to [CO2] remain controversial, and connections between changes in respiration rate and altered growth rate have not always been clear. The present experiments tested whether translocation, a major consumer of energy from respiration in exporting leaves, was sensitive to [CO2]. Nineteen-day-old soybean plants grown initially at a constant [CO2] of 350 µmol mol–1 were exposed to three consecutive nights with a [CO2] of 220–1400 µmol mol–1, with a daytime [CO2] of 350 µmol mol–1. Change in dry mass of the individual second, third and fourth trifoliate leaves over the 3-d period was determined, along with rates of respiration and photosynthesis of second leaves, measured by net CO2 exchange. Translocation was determined from mass balance for second leaves. Additional experiments were conducted where the [CO2] around individual leaves was controlled separately from that of the rest of the plant. Results indicated that low [CO2] at night increased both respiration and translocation and elevated [CO2] decreased both processes, to similar relative extents. The effect of [CO2] during the dark on the change in leaf mass over 3 d was largest in second leaves, where the change in mass was about 50 % greater at 1400 µmol mol–1 CO2 than at 220 µmol mol–1 CO2. The response of translocation to [CO2] was localized in individual leaves. Results indicated that effects of [CO2] on net carbon dioxide exchange rate in the dark either caused or reflected a change in a physiologically important process which is known to depend on energy supplied by respiration. Thus, it is unlikely that the observed effects of [CO2] on respiration were artefacts of the measurement process in this case.
Key words: Carbon dioxide, Glycine max, respiration, soybean, translocation.
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