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JXB Advance Access originally published online on November 22, 2005
Journal of Experimental Botany 2006 57(1):1-4; 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

OPINION PAPER

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

Ian C. Dodd1,* and Christine A. Beveridge2

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

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

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.

Key words: Cytokinins, leaf growth, long-distance signalling, nitrogen


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