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JXB Advance Access published online on November 22, 2005
Journal of Experimental Botany, doi:10.1093/jxb/erj021
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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 June 5, 2005
Accepted October 20, 2005

OPINION PAPER

Xylem-borne cytokinins: still in search of a role?

Ian C. Dodd 1 * and Christine A. Beveridge 2

1 Department of Biological Sciences, Lancaster Environment Centre, University of Lancaster, Lancaster LA1 4YQ, UK
2 ARC Centre of Integrative Legume Research, University of Queensland, St Lucia 4072, Australia

* To whom correspondence should be addressed.
Ian C. Dodd, E-mail: I.Dodd{at}lancaster.ac.uk


  Abstract

Leaf expansion and xylem cytokinin concentration ([X-CK]) decrease in response to nitrogen (N) deprivation. Debate continues over cause, effect, and correlation. Supporting studies provide, at best, correlative evidence that [X-CK] controls leaf growth in response to N-deprivation, while dissenting studies indicate that leaf growth responses to N can be independent of changes in X-CK supply to leaves. A model is proposed to evaluate the physiological significance to leaf growth of changes in plant and environment N concentrations, and plant CK concentrations.

Keywords: Cytokinins; leaf growth; long-distance signalling; nitrogen.
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