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Comparative Biochemistry of Ribulose Bisphosphate Carboxylase in Higher Plants

  • William L. Ogren
  • Larry D. Hunt
Part of the Basic Life Sciences book series (BLSC, volume 11)

Abstract

The agronomically important aspects of the comparative biochemistry of RuBP carboxylase are locating a natural enzyme, creating a mutant enzyme, or identifying compounds which differentially alter the enzyme so as to allow CO2 to be fixed more efficiently or O2 to be fixed less efficiently. Two interrelated approaches can be pursued in trying to increase the agronomic efficiency of the enzyme at atmospheric CO2 concentration. (i) The specific activity of the enzyme could be increased by increasing the maximal velocity of the enzyme’s action with respect to both substrates. This will cause a proportional increase in both photosynthesis and photorespiration, but, because the rate of CO2 uptake by photosynthesis exceeds the rate of CO2 loss by photorespiration under natural conditions, net photosynthesis will increase, (ii) The ratio of oxygenase activity to carboxylase activity could be decreased, thereby increasing net photosynthesis by decreasing photorespiratory CO2 evolution.

Keywords

Tall Fescue Sugar Phosphate Comparative Biochemistry Oxygenase Activity Agronomic Efficiency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • William L. Ogren
    • 1
    • 2
  • Larry D. Hunt
    • 1
  1. 1.Department of AgronomyUniversity of IllinoisUrbanaUSA
  2. 2.Science and Education AdministrationU.S. Dept. of AgricultureUSA

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