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JXB Advance Access published online on December 19, 2005
Journal of Experimental Botany, doi:10.1093/jxb/erj034
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received July 7, 2005
Accepted October 27, 2005

PHENOTYPIC PLASTICITY AND THE CHANGING ENVIRONMENT SPECIAL ISSUE ARTICLE

Plant responses to potassium deficiencies: a role for potassium transport proteins

M. K. Ashley 1, M. Grant 1, and A. Grabov 1 *

1 Division of Biology, Imperial College London, Wye Campus, Wye, Ashford TN25 5AH, Kent, UK

* To whom correspondence should be addressed.
A. Grabov, E-mail: a.grabov{at}imperial.ac.uk


  Abstract

The availability of potassium to the plant is highly variable, due to complex soil dynamics, which are strongly influenced by root-soil interactions. A low plant potassium status triggers expression of high affinity K+ transporters, up-regulates some K+ channels, and activates signalling cascades, some of which are similar to those involved in wounding and other stress responses. The molecules that signal low K+ status in plants include reactive oxygen species and phytohormones, such as auxin, ethylene and jasmonic acid. Apart from up-regulation of transport proteins and adjustment of metabolic processes, potassium deprivation triggers developmental responses in roots. All these acclimation strategies enable plants to survive and compete for nutrients in a dynamic environment with a variable availability of potassium.

Keywords: Acclimation; mineral nutrition; plant plasticity; potassium; potassium deficiencies.
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