Leaf respiratory CO2 is 13C-enriched relative to leaf organic components in five species of C3 plants

Xu, Cheng-Yuan and Lin, Guang-Hui and Griffin, Kevin L. and Sambrotto, Raymond N. (2004) Leaf respiratory CO2 is 13C-enriched relative to leaf organic components in five species of C3 plants. New Phytologist, 163 (3). pp. 499-505. ISSN 0028-646X


Here, we compared the carbon isotope ratios of leaf respiratory CO2 (13CR) and leaf organic components (soluble sugar, water soluble fraction, starch, protein and bulk organic matter) in five C3 plants grown in a glasshouse and inside Biosphere 2. One species, Populus deltoides, was grown under three different CO2 concentrations.
The Keeling plot approach was applied to the leaf scale to measure leaf 13CR and these results were compared with the 13C of leaf organic components.
In all cases, leaf respiratory CO2 was more 13C-enriched than leaf organic components. The amount of 13C enrichment displayed a significant species-specific pattern, but the effect of CO2 treatment was not significant on
P. deltoides.
In C3 plant leaves, 13C-enriched respiratory CO2 appears widespread. Among currently hypothesized mechanisms contributing to this phenomenon, non-statistical carbon isotope distribution within the sugar substrates seems most likely. However, caution should be taken when attempting to predict the 13C of leaf respiratory CO2 at the ecosystem scale by upscaling the relationship between leaf 13CR and 13C of leaf organic components.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version not held.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 04 May 2010 01:44
Last Modified: 02 Jul 2013 23:49
Uncontrolled Keywords: C3 plants; carbon isotope; dark respiration; fractionation; keeling plot
Fields of Research : 06 Biological Sciences > 0607 Plant Biology > 060705 Plant Physiology
05 Environmental Sciences > 0501 Ecological Applications > 050102 Ecosystem Function
10 Technology > 1001 Agricultural Biotechnology > 100101 Agricultural Biotechnology Diagnostics (incl. Biosensors)
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8299 Other Plant Production and Plant Primary Products > 829999 Plant Production and Plant Primary Products not elsewhere classified
Identification Number or DOI: 10.1111/j.1469-8137.2004.01153.x
URI: http://eprints.usq.edu.au/id/eprint/7682

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