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AOBPreview originally published online on December 17, 2007
Annals of Botany 2008 101(4):485-489; doi:10.1093/aob/mcm313
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

BOTANICAL BRIEFING

Cytosolic Nitrate Ion Homeostasis: Could it Have a Role in Sensing Nitrogen Status?

Anthony J. Miller* and Susan J. Smith

Centre for Soils and Ecosystem Function, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK

* For correspondence. E-mail tony.miller{at}bbsrc.ac.uk

Received: 6 July 2007    Returned for revision: 14 August 2007    Accepted: 14 November 2007    Published electronically: 17 December 2007

Background and Aims: There is ongoing debate regarding homeostasis of cytosolic nutrient ion concentrations. This deliberation centres on the question of whether homeostasis occurs for some nutrients and, if so, what are the consequences for how plants sense their nutrient status. Particularly for nitrate, this controversy has focused on the methods used and the cellular pools which they measure. Cytoplasm and cytosol have been distinguished and it has been suggested that two ranges of nitrate values can be separated depending on whether the method separates the pools found in organelles.

Scope: The present study defines homeostasis of nutrient ions and discusses how whole organ averaging techniques can hide important cellular differences that can help to explain some of the discrepancies between results reported by various methods. These results are considered in relation to a possible role in signalling nutrient status, and have relevance to other averaging techniques such as the use of ‘omics’ technologies.

Key words: Hordeum vulgare, homeostasis, cytosolic nitrate, compartmentation, ion-selective microelectrodes


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