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Journal of Experimental Botany, Vol. 54, No. 382, pp. 489-494, January 1, 2003
© 2003 Oxford University Press

Balancing supply and demand: the spatial regulation of carbon metabolism in grass and cereal leaves

Received 19 April 2002; Accepted 2 September 2002

Chris Pollock3,1, John Farrar2, Deri Tomos2, Joe Gallagher1, Chungui Lu2 and Olga Koroleva4,2

1 Institute of Grassland and Environmental Research, Aberystwyth SY23 3EB, Wales, UK
2 School of Biological Sciences, University of Wales Bangor, Deiniol Road, Bangor LL57 5UW, Wales, UK

3 To whom corresppondence should be addressed. Fax: +44 (0)1970 820212. E-mail: chris.pollock{at}bbsrc.ac.uk
4 Present address: John Innes Centre, Colney Lane, Norwich, UK.

Leaf primary metabolism responds to changes in both supply of inputs and demand for products. Metabolic control in leaves changes both spatially and temporally. Using leaves of C3 temperate Gramineae, the spatial control of carbohydrate metabolism has been studied using a range of approaches. Single-cell sampling and subsequent analysis of metabolites, proteins and transcripts has indicated significant differences between epidermal, mesophyll and parenchymatous bundle sheath cells. These differences correlate with differentiated function as heterotrophic, autotrophic and transport pathway components of the leaf. The review emphasizes the key role of sucrose and discusses its catabolism to hexoses and its anabolism to fructans as mechanisms for the preservation of sucrose gradients within the leaf.

Key words: Cell types, fructan, leaf, sucrose, transcripts.


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