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Journal of Experimental Botany, Vol. 54, No. 382, pp. 569-575, January 1, 2003
© 2003 Oxford University Press

Starch synthesis and carbon partitioning in developing endosperm

Received 5 April 2002; Accepted 6 September 2002

M. J. Emes3,1, C. G. Bowsher1, C. Hedley1, M. M. Burrell2, E. S. F. Scrase-Field1 and I. J. Tetlow1

1 School of Biological Sciences, University of Manchester, 3.614 Stopford Building, Manchester M13 9PT, UK
2 Advanced Technologies (Cambridge), Cambridge Science Park, Cambridge CB4 4WA, UK

3 Present address and to whom correspondence should be sent: College of Biological Science, University of Guelph, McNally House, N1G 2W1 Canada. Fax: +1 519 767 2044. E-mail: memes{at}uoguelph.ca

The biosynthesis of starch is the major determinant of yield in cereal grains. In this short review, attention is focused on the synthesis of the soluble substrate for starch synthesis, ADPglucose (ADPG). Consideration is given to the pathway of ADPG production, its subcellular compartmentation, and the role of metabolite transporters in mediating its delivery to the site of starch synthesis. As ADPG is an activated sugar, the dependence of its production on respiration, changes which occur during development, and the constraints which ATP production may place on carbon partitioning into different end-prod ucts are discussed.

Key words: ADPglucose, carbon partitioning, cereals, development, endosperm, starch.


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