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Plant Biol (Stuttg) 2003; 5(3): 215-232
DOI: 10.1055/s-2003-40798
Review Article

Georg Thieme Verlag Stuttgart · New York

A Comparison of the Sucrose Transporter Systems of Different Plant Species

C. Kühn 1
  • 1Institut für Pflanzenphysiologie, Humboldt Universität, Berlin, Germany
Further Information

Publication History

Publication Date:
22 July 2003 (online)

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Abstract

The sucrose uptake behaviour of many different plant species is characterised by the presence of at least two components with distinct kinetic properties. These include at least one high-affinity and one low-affinity transport system. All known sucrose transporters from higher plants fall into one of three large subfamilies, according to phylogenetic analysis. Apparently, the largest subfamily, the SUT1 subfamily, exclusively consists of high-affinity sucrose transporters from dicotyledons, whereas none of the transporters from monocotyledonous plants groups within this subfamily. The other two subfamilies of sucrose transporter-like proteins are either low-affinity transporter or putative sucrose-sensing proteins. Most of the known sucrose transporters from monocotyledons are closely related to the SUT2 subfamily and include high-affinity transporters, suggesting a different evolutionary origin of dicotyledonous and monocotyledonous sucrose transporter gene families.

Key words

Sucrose transport - sucrose sensing - protein-protein interaction - phloem loading

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C. Kühn

Institut für Pflanzenphysiologie
Humboldt Universität

Philippstraße 13, Haus 12

10115 Berlin

Germany

Email: christina.kuehn@biologie.hu-berlin.de

Section Editor: G. Gottsberger