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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1093/jxb/ert058
|2 doi
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|a pubmed24n1340.xml
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|a (NLM)23630324
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Walker, Berkley J
|e verfasserin
|4 aut
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|a Influence of temperature on measurements of the CO2 compensation point
|b differences between the Laisk and O2-exchange methods
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|c 2013
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 30.05.2014
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|a Date Revised 22.03.2024
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|a published: Print
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|a Citation Status MEDLINE
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|a The CO2 compensation point in the absence of day respiration (Γ*) is a key parameter for modelling leaf CO2 exchange. Γ* links the kinetics of ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco) with the stoichiometry of CO2 released per Rubisco oxygenation from photorespiration (α), two essential components of biochemical models of photosynthesis. There are two main gas-exchange methods for measuring Γ*: (i) the Laisk method, which requires estimates of mesophyll conductance to CO2 (g m) and (ii) measurements of O2 isotope exchange, which assume constant values of α and a fixed stoichiometry between O2 uptake and Rubisco oxygenation. In this study, the temperature response of Γ* measured using the Laisk and O2-exchange methods was compared under ambient (25 °C) and elevated (35 °C) temperatures to determine whether both methods yielded similar results. Previously published temperature responses of Γ* estimated with the Laisk and O2-exchange methods in Nicotiana tabacum demonstrated that the Laisk-derived model of Γ* was more sensitive to temperature compared with the O2-exchange model. Measurements in Arabidopsis thaliana indicated that the Laisk and O2-exchange methods produced similar Γ* at 25 °C; however, Γ* values from O2 exchange were lower at 35 °C compared with the Laisk method. Compared with a photorespiratory mutant (pmdh1pmdh2hpr) with increased α, wild-type (WT) plants had lower Laisk values of Γ* at 25 °C but were not significantly different at 35 °C. These differences between Laisk and O2 exchange values of Γ* at 35 °C could be explained by temperature sensitivity of α in WT and/or errors in the assumptions of O2 exchange. The differences between Γ* measured using the Laisk and O2-exchange method with temperature demonstrate that assumptions used to measure Γ*, and possibly the species-specific validity of these assumptions, need to be considered when modelling the temperature response of photosynthesis
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Carbon Dioxide
|2 NLM
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|a 142M471B3J
|2 NLM
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|a Ribulose-Bisphosphate Carboxylase
|2 NLM
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| 650 |
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7 |
|a EC 4.1.1.39
|2 NLM
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| 650 |
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|a Oxygen
|2 NLM
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| 650 |
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|a S88TT14065
|2 NLM
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| 700 |
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|a Cousins, Asaph B
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 64(2013), 7 vom: 29. Apr., Seite 1893-905
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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| 773 |
1 |
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|g volume:64
|g year:2013
|g number:7
|g day:29
|g month:04
|g pages:1893-905
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|u http://dx.doi.org/10.1093/jxb/ert058
|3 Volltext
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