Plant Physiol. Drug Metab Dispos
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Plant Physiology 99:1275-1278 (1992)
© 1992 American Society of Plant Biologists

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Update on Metabolism

Role of Sucrose-Phosphate Synthase in Sucrose Metabolism in Leaves 1

Steven C. Huber and Joan L. Huber

U.S. Department of Agriculture, Agricultural Research Service, North Carolina State University, Raleigh, North Carolina 27695-7631, Department of Botany, Plant Physiology Program, North Carolina State University, Raleigh, North Carolina 27695-7631, Department of Crop Science, Plant Physiology Program, North Carolina State University, Raleigh, North Carolina 27695-7631

Sucrose is formed in the cytoplasm of leaf cells from triose phosphates exported from the chloroplast. Flux control is shared among key enzymes of the pathway, one of which is sucrose-phosphate synthase (SPS). Regulation of SPS by protein phosphorylation is important in vivo and may explain diurnal changes in SPS activity and carbon partitioning. The signal transduction pathway mediating the light activation of SPS in vivo appears to involve metabolites and novel "coarse" control of the protein phosphatase that dephosphorylates and activates SPS. Regulation of the phosphorylation of SPS may provide a general mechanism whereby sucrose formation is coordinated with the rate of photosynthesis and the rate of nitrate assimilation. There are apparent differences among species in the properties of SPS that may reflect different strategies for the control of carbon partitioning. The SPS gene has recently been cloned from maize; results of preliminary studies with transgenic tomato plants expressing high levels of maize SPS support the postulate that SPS activity can influence the partitioning of carbon between starch and sucrose.

1 Cooperative investigations of the U.S. Department of Agriculture, Agricultural Research Service, and the North Carolina Agricultural Research Service, Raleigh, NC 27695-7643. Funded in part by grants from the National Science Foundation (DCB 881744) and the Department of Energy (DE-AI05-91ER20031). Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the United States Department of Agriculture, or the North Carolina Agricultural Research Service and does not imply its approval to the exclusion of other products that may also be suitable.




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Copyright © 1992 by the American Society of Plant Biologists