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Photosynth Res. 2017 Jun;132(3):245-255. doi: 10.1007/s11120-017-0369-8. Epub 2017 Mar 28.

Uncertainty in measurements of the photorespiratory CO2 compensation point and its impact on models of leaf photosynthesis.

Author information

1
Global Change and Photosynthesis Research Unit, United State Department of Agriculture/Agricultural Research Services, University of Illinois, 1206 W Gregory Dr., Urbana, IL, 61801, USA.
2
Carl R. Woese Institute for Genomic Biology, University of Illinois, Urbana, IL, 61801, USA.
3
Biochemistry of Plants, Heinrich-Heine University, Düsseldorf, Germany.
4
Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK.
5
Plant Biology and Crop Science, Rothamsted Research, Harpenden, AL5 2JQ, UK.
6
Department of Plant Biology, University of Illinois, Urbana, IL, 61801, USA.
7
Global Change and Photosynthesis Research Unit, United State Department of Agriculture/Agricultural Research Services, University of Illinois, 1206 W Gregory Dr., Urbana, IL, 61801, USA. d-ort@illinois.edu.
8
Carl R. Woese Institute for Genomic Biology, University of Illinois, Urbana, IL, 61801, USA. d-ort@illinois.edu.
9
Department of Plant Biology, University of Illinois, Urbana, IL, 61801, USA. d-ort@illinois.edu.

Abstract

Rates of carbon dioxide assimilation through photosynthesis are readily modeled using the Farquhar, von Caemmerer, and Berry (FvCB) model based on the biochemistry of the initial Rubisco-catalyzed reaction of net C3 photosynthesis. As models of CO2 assimilation rate are used more broadly for simulating photosynthesis among species and across scales, it is increasingly important that their temperature dependencies are accurately parameterized. A vital component of the FvCB model, the photorespiratory CO2 compensation point (Γ *), combines the biochemistry of Rubisco with the stoichiometry of photorespiratory release of CO2. This report details a comparison of the temperature response of Γ * measured using different techniques in three important model and crop species (Nicotiana tabacum, Triticum aestivum, and Glycine max). We determined that the different Γ * determination methods produce different temperature responses in the same species that are large enough to impact higher-scale leaf models of CO2 assimilation rate. These differences are largest in N. tabacum and could be the result of temperature-dependent increases in the amount of CO2 lost from photorespiration per Rubisco oxygenation reaction.

KEYWORDS:

Modeling photosynthesis; Photorespiration; Rubisco; Temperature response

PMID:
28382593
PMCID:
PMC5443873
DOI:
10.1007/s11120-017-0369-8
[Indexed for MEDLINE]
Free PMC Article

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