Journal Article

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

Anthony J. Miller and Susan J. Smith

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 101, issue 4, pages 485-489
Published in print March 2008 | ISSN: 0305-7364
Published online December 2007 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcm313
Cytosolic Nitrate Ion Homeostasis: Could it Have a Role in Sensing Nitrogen Status?

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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.

Keywords: Hordeum vulgare; homeostasis; cytosolic nitrate; compartmentation; ion-selective microelectrodes

Journal Article.  3530 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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