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AOBPreview published online on May 30, 2006
Annals of Botany, doi:10.1093/aob/mcl099
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© The Author 2006. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received December 12, 2005
Revised February 22, 2006
Accepted March 27, 2006

Botanical Briefing

Enigma Variations for Peptides and Their Transporters in Higher Plants

WANDA M. WATERWORTH 1 and CLIFFORD M. BRAY 1 *

1 Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK

* To whom correspondence should be addressed.
CLIFFORD M. BRAY, E-mail: cliff.bray{at}manchester.ac.uk


  Abstract

• Background. Two families of proteins that transport small peptides, the oligopeptide transporters (OPTs) and the peptide transporters (PTRs), have been recognized in eukaryotes. Higher plants contain a far greater number of genes for these transporters than do other eukaryotes. This may be indicative of the relative importance of (oligo)peptides and their transport to plant growth and metabolism.

• Recent progress. Recent studies are now allowing us to assign functions to these transporters and are starting to identify their in-planta substrates, revealing unexpected and important contributions of the transporters to plant growth and developmental processes. This Botanical Briefing appraises recent findings that PTRs and OPTs have key roles to play in the control of plant cell growth and development. Evidence is presented that some of these transporters have functions outside that of nitrogen nutrition and that these carriers can also surprise us with their totally unexpected choice of substrates.

Keywords: Transport, peptides, PTR, OPT, nitrogen reallocation, Arabidopsis, cereal, Hordeum vulgare.
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