AustralieFrV1, Main, Exploration, bibRecord, 00C544

Acclimation of the respiration/photosynthesis ratio to temperature: insights from a model

Identifieur interne : 00C544 ( Main/Exploration ); précédent : 00C543; suivant : 00C545

Acclimation of the respiration/photosynthesis ratio to temperature: insights from a model

Auteurs : Roderick C. Dewar ; Belinda E. Medlyn [Royaume-Uni] ; Ross. E. Mcmurtrie [Australie]

Source :

Global Change Biology [ 1354-1013 ] ; 1999-06.

RBID : ISTEX:A6BE32A8DE84F912FE7F77BD23989A68006BD8EE

Descripteurs français

Wicri :
- topic : Réchauffement climatique, Chiffre d'affaires.

English descriptors

Abstract

Based on short‐term experiments, many plant growth models – including those used in global change research – assume that an increase in temperature stimulates plant respiration (R) more than photosynthesis (P), leading to an increase in the R/P ratio. Longer‐term experiments, however, have demonstrated that R/P is relatively insensitive to growth temperature. We show that both types of temperature response may be reconciled within a simple substrate‐based model of plant acclimation to temperature, in which respiration is effectively limited by the supply of carbohydrates fixed through photosynthesis. The short‐term, positive temperature response of R/P reflects the transient dynamics of the nonstructural carbohydrate and protein pools; the insensitivity of R/P to temperature on longer time‐scales reflects the steady‐state behaviour of these pools. Thus the substrate approach may provide a basis for predicting plant respiration responses to temperature that is more robust than the current modelling paradigm based on the extrapolation of results from short‐term experiments. The present model predicts that the acclimated R/P depends mainly on the internal allocation of carbohydrates to protein synthesis, a better understanding of which is therefore required to underpin the wider use of a constant R/P as an alternative modelling paradigm in global change research.

Url:

https://api.istex.fr/document/A6BE32A8DE84F912FE7F77BD23989A68006BD8EE/fulltext/pdf

DOI: 10.1046/j.1365-2486.1999.00253.x

Affiliations:

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Le document en format XML

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<term>Atmospheric carbon dioxide concentration</term>
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<term>Behaviour</term>
<term>Berry bjorkman</term>
<term>Better understanding</term>
<term>Bjorkman</term>
<term>Blackwell science</term>
<term>Carbohydrate</term>
<term>Carboxylation</term>
<term>Crop science</term>
<term>Current modelling paradigm</term>
<term>Current paradigm</term>
<term>Dynamic response</term>
<term>Ehleringer bjorkman</term>
<term>Experimental biology</term>
<term>Forest ecology</term>
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<term>Leaf protein synthesis</term>
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<term>Leaf temperature</term>
<term>Mccree troughton</term>
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<term>Photosynthesis</term>
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<term>Physiologia plantarum</term>
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<term>Woodwell</term>
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<term>Berry bjorkman</term>
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<term>Carbohydrate</term>
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<term>Crop science</term>
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<term>Dynamic response</term>
<term>Ehleringer bjorkman</term>
<term>Experimental biology</term>
<term>Forest ecology</term>
<term>Forest growth experiment</term>
<term>Fractional turnover rates</term>
<term>Frossard friaud</term>
<term>Frost hardiness</term>
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<term>Temperature effects</term>
<term>Temperature response</term>
<term>Temperature responses</term>
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<front><div type="abstract" xml:lang="en">Based on short‐term experiments, many plant growth models – including those used in global change research – assume that an increase in temperature stimulates plant respiration (R) more than photosynthesis (P), leading to an increase in the R/P ratio. Longer‐term experiments, however, have demonstrated that R/P is relatively insensitive to growth temperature. We show that both types of temperature response may be reconciled within a simple substrate‐based model of plant acclimation to temperature, in which respiration is effectively limited by the supply of carbohydrates fixed through photosynthesis. The short‐term, positive temperature response of R/P reflects the transient dynamics of the nonstructural carbohydrate and protein pools; the insensitivity of R/P to temperature on longer time‐scales reflects the steady‐state behaviour of these pools. Thus the substrate approach may provide a basis for predicting plant respiration responses to temperature that is more robust than the current modelling paradigm based on the extrapolation of results from short‐term experiments. The present model predicts that the acclimated R/P depends mainly on the internal allocation of carbohydrates to protein synthesis, a better understanding of which is therefore required to underpin the wider use of a constant R/P as an alternative modelling paradigm in global change research.</div>
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Acclimation of the respiration/photosynthesis ratio to temperature: insights from a model

Acclimation of the respiration/photosynthesis ratio to temperature: insights from a model

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri