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Plasma membrane anion channels in higher plants and their putative functions in roots.

Roberts, Stephen K. (2006) Plasma membrane anion channels in higher plants and their putative functions in roots. New Phytologist, 169 (4). pp. 647-666. ISSN 0028-646X

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Abstract

Recent years have seen considerable progress in identifying anion channel activities in higher plant cells. This review outlines the functional properties of plasma membrane anion channels in plant cells and discusses their likely roles in root function. Plant anion channels can be grouped according to their voltage dependence and kinetics: (1) depolarization-activated anion channels which mediate either anion efflux (R and S types) or anion influx (outwardly rectifying type); (2) hyperpolarization-activated anion channels which mediate anion efflux, and (3) anion channels activated by light or membrane stretch. These types of anion channel are apparent in root cells where they may function in anion homeostasis, membrane stabilization, osmoregulation, boron tolerance and regulation of passive salt loading into the xylem vessels. In addition, roots possess anion channels exhibiting unique properties which are consistent with them having specialized functions in root physiology. Most notable are the organic anion selective channels, which are regulated by extracellular Al3+ or the phosphate status of the plant. Finally, although the molecular identities of plant anion channels remain elusive, the diverse electrophysiological properties of plant anion channels suggest that large and diverse multigene families probably encode these channels.

Item Type: Article
Journal or Publication Title: New Phytologist
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Health and Medicine > Biomedical & Life Sciences
ID Code: 9509
Deposited By: Dr Stephen K Roberts
Deposited On: 12 Jun 2008 13:46
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:38
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9509

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