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Annals of Botany 88: 803-812, 2001
© 2001 Annals of Botany Company

COMMUNICATION

Why and How Do Plant Cells Sense Sugars?

Elena Loreti, Luigi De Bellis, Amedeo Alpi and Pierdomenico Perata+

Department of Crop Plant Biology, University of Pisa, Via Mariscoglio 34, 56124, Pisa, Italy Department of Biology, University of Lecce, Via Provinciale Lecce-Monteroni, 73100, Lecce, Italy Department of Agricultural Sciences, University of Modena and Reggio Emilia, Via Kennedy 17, 42100, Reggio Emilia, Italy

Received: 19 March 2001 ; Returned for revision: 14 June 2001 . Accepted: 17 July 2001

ABSTRACT

The ability to sense sugars is crucial for the modulation of gene expression in plants. Despite the importance of this phenomenon, our knowledge of sugar sensing in plants is scant. Several valuable hypotheses have been put forward based on the extensive knowledge of sugar sensing in yeast. In recent years, tests of these hypotheses have shown that hexokinase and sucrose-non-fermenting- (SNF-) related proteins appear to be involved in sugar sensing and transduction, not only in yeast but also in higher plants. However, even if plants share with yeast some elements involved in sugar sensing, several aspects of sugar perception are likely to be peculiar to higher plants. Plants should be able to sense not only glucose but also other hexoses, such as fructose and disaccharides (sucrose, maltose and others). In this Botanical Briefing we outline recent discoveries in this field, with emphasis on arabidopsis and cereals. The use of transgenic plants and mutants to identify sugar sensor(s) and elements in the signalling pathways and their cross-talk with the hormonal signalling is discussed.Copyright 2001 Annals of Botany Company

Abscisic acid, Arabidopsis thaliana, cereals, hexokinase, sugar sensing


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