The relationship between the Rubisco reaction mechanism and models of photosynthesis *

The relationship between the Rubisco reaction mechanism and models of photosynthesis * Abstract. A new model of photosynthesis published recently in this journal (H. Farazdaghi & G. E. Edwards, Plant, Cell and Environment (1988) 11, 789–798; 799–809) clams to have a more complete mechanistic basis than currently used models based on the paper of G. D. Farquhar, S. von Caemmerer & J. A. Berry (Planta (1980) 149, 78–90). In this paper, we examine the validity of the new kinetic expression for the rate of CO2 fixation by Rubisco, and the derivation of an equation for photosynthetic CO2 assimilation as a function of light intensity and CO2 concentration presented in the new model. In addition, we compare measured response curve of photosynthesis to CO2 and light with simulated curves using alternative models. We conclude that the new model is mechanistically misleading and, empirically, overestimates the extent to which light and CO2 co‐limit the rate of photosynthesis under most physiological conditions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Cell & Environment Wiley

The relationship between the Rubisco reaction mechanism and models of photosynthesis *

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Publisher
Wiley
Copyright
Copyright © 1990 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0140-7791
eISSN
1365-3040
DOI
10.1111/j.1365-3040.1990.tb01306.x
Publisher site
See Article on Publisher Site

Abstract

Abstract. A new model of photosynthesis published recently in this journal (H. Farazdaghi & G. E. Edwards, Plant, Cell and Environment (1988) 11, 789–798; 799–809) clams to have a more complete mechanistic basis than currently used models based on the paper of G. D. Farquhar, S. von Caemmerer & J. A. Berry (Planta (1980) 149, 78–90). In this paper, we examine the validity of the new kinetic expression for the rate of CO2 fixation by Rubisco, and the derivation of an equation for photosynthetic CO2 assimilation as a function of light intensity and CO2 concentration presented in the new model. In addition, we compare measured response curve of photosynthesis to CO2 and light with simulated curves using alternative models. We conclude that the new model is mechanistically misleading and, empirically, overestimates the extent to which light and CO2 co‐limit the rate of photosynthesis under most physiological conditions.

Journal

Plant Cell & EnvironmentWiley

Published: Apr 1, 1990

References

  • A model for photosynthesis and photorespiration in C 3 plants based on the biochemistry and stoichiometry of the pathways
    Farazdaghi, Farazdaghi; Edwards, Edwards
  • A model of leaf photosynthesis and respiration for predicting carbon dioxide assimilation in different environments
    Hall, Hall

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