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

Article

Xu, Cheng-Yuan, Lin, Guang-Hui, 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. https://doi.org/10.1111/j.1469-8137.2004.01153.x
Article Title

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

ERA Journal ID2625
Article CategoryArticle
AuthorsXu, Cheng-Yuan (Author), Lin, Guang-Hui (Author), Griffin, Kevin L. (Author) and Sambrotto, Raymond N. (Author)
Journal TitleNew Phytologist
Journal Citation163 (3), pp. 499-505
Number of Pages7
Year2004
PublisherJohn Wiley & Sons
Place of PublicationOxford, United Kingdom
ISSN0028-646X
1469-8137
Digital Object Identifier (DOI)https://doi.org/10.1111/j.1469-8137.2004.01153.x
Web Address (URL)http://www.newphytologist.com/view/0/index.html
Abstract

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.

KeywordsC3 plants; carbon isotope; dark respiration; fractionation; keeling plot
ANZSRC Field of Research 2020310806. Plant physiology
410203. Ecosystem function
300101. Agricultural biotechnology diagnostics (incl. biosensors)
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Byline AffiliationsOffice of Research
Columbia University, United States
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