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Journal of Experimental Botany, Vol. 53, No. 376, pp. 1837-1845, September 1, 2002
© 2002 Oxford University Press

Manipulating PEPC levels in plants

Received 17 April 2002; Accepted 21 June 2002

M. Jeanneau1, J. Vidal3,1, A. Gousset-Dupont1, B. Lebouteiller1, M. Hodges1, D. Gerentes2 and P. Perez2

1 Institut de Biotechnologie des Plantes, UMR CNRS 8618, Université de Paris Sud, F-91405 Orsay cedex, France
2 Biogemma, Campus Universitaire des Cézeaux, F-63170 Aubière, France

3 To whom correspondence should be addressed. Fax: +33 1 69 15 34 23. E-mail: jean.vidal{at}ibp.u-psud.fr

This review examines the current understanding of the structural, functional and regulatory properties of C4 and C3 forms of higher plant phosphoenolpyruvate carboxylase. The emphasis is on the interactive metabolic and post-translational controls acting on the enzyme in the physiological context of C4 photosynthesis and the anaplerotic pathway. A brief overview is given concerning the recent developments of PEPC-based genetic engineering of C3 plants with the aim of improving photosynthetic performance in normal and limiting environmental conditions. So far, in spite of achieving a considerable increase in PEPC levels, more work needs to be done with respect to the correct dosage and location before that goal is reached. Some unpublished results on the transformation of maize with a sorghum C4 PEPC cDNA are also presented. They show that it is possible to increase photosynthetic PEPC levels in this C4 plant and that the modification in enzyme content has a pleiotropic physiological impact and, notably, an improved water use efficiency when water is limited.

Key words: Key words: Genetic engineering, phosphoenolpyruvate carboxylase, signal transduction.


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