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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

The regulation of assimilate allocation and transport

Hanjo Hellmann, Laurence Barker, Dietmar Funck and Wolf B. Frommer

Australian Journal of Plant Physiology 27(6) 583 - 594
Published: 2000

Abstract

In higher plants, sugars possess multiplefunctions: transport and storage of carbon and energy as well as signalmolecules. A variety of sugar transporters have been cloned that showdifferential expression between source and sink tissues. Expression of thesetransporters is highly regulated, according to the local metabolic status andthe demands of long distance transport. Very little knowledge is available onmechanisms underlying the regulation of sugar transporter expression inplants. Studies in E. coli, yeast and mammals haveunravelled complex regulatory pathways with crosstalk between sugar transportand metabolism. Recent studies in plants provide increasing evidence for theexistence of similar regulatory mechanisms. In many cases, connections havebeen found between C-and N-metabolism, implicating a tight network of signaltransduction and metabolism. Some aspects of this network are presented inthis review, emphasising sugar transport and sugar signaltransduction.

Keywords: apoplasmic, hexose, phloem,phloem loading, plasma membrane, saccharide, signal transduction, sucrose,symplasmic, transport.

https://doi.org/10.1071/PP99189

© CSIRO 2000

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