Abstract
The metabolism of fructose polymers (fructans) in temperate Gramineae provides an interesting and distinctive alternative to that of starch. This review concentrates upon the characterisation of novel elements of fructan metabolism. Fructan structures are shown to be both varied and complex, but to possess a consistency within species which argues for a biosynthetic mechanism with a high degree of specificity. The synthetic and degradative mechanisms currently thought to be involved are discussed, with particular reference to the presence of multifunctional enzymes and the strong effects of both substrate and enzyme concentration on the chemical nature of the products in vitro. The need to reconcile the behaviour of enzymes in vitro with the patterns of metabolism observed in vivo is stressed. Finally, the regulation of fructan synthesis is discussed in relation to the pivotal role of sucrose as the sole substrate and as a key element in the induction of fructan accumulation, apparently acting at the level of gene expression.
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Pollock, C.J., Cairns, A.J., Gallagher, J., Harrison, J. (1999). The integration of sucrose and fructan metabolism in temperate grasses and cereals. In: Kruger, N.J., Hill, S.A., Ratcliffe, R.G. (eds) Regulation of Primary Metabolic Pathways in Plants. Proceedings of the Phytochemical Society of Europe, vol 42. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4818-4_10
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