AOBPreview originally published online on October 2, 2002
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Annals of Botany 90: 549-557, 2002
© 2002 Annals of Botany Company
Glutamate Receptors in Plants
1 Department of Plant Science, Downing Street, Cambridge CB2 3EA, UK
* For correspondence. Fax +44 (0)1223 333953, e-mail rjd23{at}cus.cam.ac.uk
Received: 5 April 2002; Returned for revision: 22 May 2002; Accepted: 2 July 2002 Published electronically: 2 October 2002
Ionotropic glutamate receptors function in animals as glutamate-gated non-selective cation channels. Numerous glutamate receptor-like (GLR) genes have been identified in plant genomes, and plant GLRs are predicted, on the basis of sequence homology, to retain ligand-binding and ion channel activity. Non-selective cation channels are ubiquitous in plant membranes and may function in nutrient uptake, signalling and intra-plant transport. However, there is little evidence for amino acid gating of plant ion channels. Recent evidence suggests that plant GLRs do encode non-selective cation channels, but that these channels are not gated by amino acids. The functional properties of these proteins and their roles in plant physiology remain a mystery. The problems surrounding characterization and assignation of function to plant GLRs are discussed in this Botanical Briefing, and potential roles for GLR proteins as non-selective cation channels involved in metabolic signalling are described.
Key words: Review, gutamate receptor, plant glutamate receptor, GLR, GluR, iGluR, Arabidopsis thaliana, calcium, signalling, non-selective cation channel, nitrogen metabolism.
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