A CO2 concentrating system in leaves of higher C3-plants predicted by a model based on RuBP carboxylase/oxygenase kinetics and 14CO2/12CO2 exchange

F. Mächler, B. Lehnherr, H. Schnyder, J. Nosberger

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Abstract

Mächler, F., Lehnherr, B., Schnyder, H. and Nösberger, J. 1985. A CO2 concentrating system in leaves of higher C3-plants predicted by a model based on RuBP carboxylase/oxygenase kinetics and 14CO2/12CO2 exchange.-J. exp. Bot. 36: 1542-1550.A model is presented which compares the ratio of the two activities of the enzyme nbulose bisphosphate carboxylase/oxygenase as determined in vitro with the ratio of photosynthesis to photorespiration in leaves as determined from differential 14CO2/12CO2 uptake or from CO2 compensation concentration. Discrepancies between measurements made in vitro and in vivo are attributed to the effect of a CO2 concentrating system in the leaf cells. Interference from dark respiration is discussed. A CO2 concentrating system is postulated which is efficient mainly at low temperature and low CO2 concentration.

Original languageEnglish
Pages (from-to)1542-1550
Number of pages9
JournalJournal of Experimental Botany
Volume36
Issue number10
DOIs
StatePublished - Oct 1985
Externally publishedYes

Keywords

  • -Photosynthesis
  • Photorespiration
  • Ribulose bisphosphate carboxylase/oxygenase

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