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

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Title: Acclimation of the respiration/photosynthesis ratio to temperature: insights from a model.
Authors: Dewar, Roderick C.1, Medlyn, Belinda E.2, Mcmurtrie, RosS. E.3
Source: Global Change Biology. Jun99, Vol. 5 Issue 5, p615-622. 8p.
Subjects: Plants, Acclimatization (Plants), Photosynthesis, Temperature
Abstract: SummaryBased 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. [ABSTRACT FROM AUTHOR]
Copyright of Global Change Biology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 5608074
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PubType: Academic Journal
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  Data: <searchLink fieldCode="DE" term="%22Plants%22">Plants</searchLink><br /><searchLink fieldCode="DE" term="%22Acclimatization+%28Plants%29%22">Acclimatization (Plants)</searchLink><br /><searchLink fieldCode="DE" term="%22Photosynthesis%22">Photosynthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature%22">Temperature</searchLink>
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  Data: SummaryBased 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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Global Change Biology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1046/j.1365-2486.1999.00253.x
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 8
        StartPage: 615
    Subjects:
      – SubjectFull: Plants
        Type: general
      – SubjectFull: Acclimatization (Plants)
        Type: general
      – SubjectFull: Photosynthesis
        Type: general
      – SubjectFull: Temperature
        Type: general
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      – TitleFull: Acclimation of the respiration/photosynthesis ratio to temperature: insights from a model.
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            NameFull: Medlyn, Belinda E.
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            NameFull: Mcmurtrie, RosS. E.
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            – D: 01
              M: 06
              Text: Jun99
              Type: published
              Y: 1999
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              Value: 5
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              Value: 5
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