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Respiratory CO2 is 13C-enriched in five C3 plants
Conference poster

Respiratory CO2 is 13C-enriched in five C3 plants

Cheng Yuan Xu, G H Kin, K L Griffin and R N Sambrotto
Ecological Society of America (ESA) Annual Meeting and International Society for Ecological Modelling (ISEM) North America Chapter: Uplands to Lowlands: coastal processes in a time of global change, 88th (Savannah, United States, 02-Aug-2003–03-Aug-2003)
2003
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Abstract

Plant Biology carbon isotope fractionation dark respiration keeling plot
We compared the carbon isotope ratios between respiratory CO2 and leaf organic components (soluble sugar, water soluble fraction, starch, protein and bulk organic matter) in 5 C3 plants grown in green house and Biosphere 2, including one species, Populus deltoides, in 3 different growth CO2 concentrations. For all species or CO2 treatments, respiratory CO2 was 13C-enriched in comparison with all leaf organic components, but the amount of enrichment does not depend on the signature of the organic components examined. We also found that 13C of leaf organic components are correlated to 13C of leaf respiratory CO2. The amount of 13C enrichment was significantly influenced by the type of organic component examined, but not by species or CO2 treatments. We argue that in normal growth condition, non-statistical carbon isotope distribution in sugar may determine the signature of respiratory CO2 dominantly. These results suggest that 1) 13C-enriched respiratory CO2 is widespread in C3 plants and 2) we can predict 13C of respiratory CO2 for ecosystem scale study by combining the average 13C-enrichment in respiratory CO2 and the signatures of leaf organic components.

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