On the 16O/18O isotope effect associated with photosynthetic O2 production
Guillaume Tcherkez A B D and Graham D. Farquhar CA Plateforme Métabolisme-Métabolome, IFR87, Université Paris-Sud XI, Orsay 91405, France.
B Laboratoire d’écophysiologie végétale, CNRS UMR 8079, Université Paris-Sud XI, Orsay 91405, France.
C Environmental Biology Group, Research School of Biological Sciences, Australian National University, Canberra, ACT 2601, Australia.
D Corresponding author. Email: guillaume.tcherkez@u-psud.fr
Functional Plant Biology 34(11) 1049-1052 https://doi.org/10.1071/FP07168
Submitted: 2 July 2007 Accepted: 13 September 2007 Published: 1 November 2007
Abstract
While photosynthetically evolved O2 has been repeatedly shown to have nearly the same oxygen isotope composition as source water so that there is no corresponding 16O/18O isotope effect, some recent 18O-enrichment studies suggest that a large isotope effect may occur, thus feeding a debate in the literature. Here, the classical theory of isotope effects was applied to show that a very small isotope effect is indeed expected during O2 production. Explanations of the conflicting results are briefly discussed.
Acknowledgements
The authors acknowledge the financial support provided by both the French and Australian Governments through the FAST project, under contract no. 12795 WC. Both authors warmly thank Prof. T. Wydrzynski and Dr W. Hillier for the critical reading of the manuscript and their helpful comments. G.F. acknowledges the Australian Research Council.
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