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JXB Advance Access published online on December 23, 2005
Journal of Experimental Botany, doi:10.1093/jxb/erj052
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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 August 15, 2005
Accepted November 11, 2005

FOCUS PAPER

NO way to live; the various roles of nitric oxide in plant-pathogen interactions

Luis A. J. Mur 1 *, Tim L. W. Carver 2, and Elena Prats 3

1 University of Wales Aberystwyth, Institute of Biological Sciences, Aberystwyth, Ceredigion SY23 2DA, UK
2 Institute of Grassland and Environmental Research, Aberystwyth, Ceredigion SY23 3EB, UK
3 Instituto de Agricultura Sostenible IAS-CSIC; Alameda del Obispo Apdo 4084, E-14080 Córdoba, Spain

* To whom correspondence should be addressed.
Luis A. J. Mur, E-mail: lum{at}aber.ac.uk


  Abstract

Nitric oxide has attracted considerable interest from plant pathologists due its established role in regulating mammalian anti-microbial defences, particularly via programmed cell death (PCD). Although NO plays a major role in plant PCD elicited in response to certain types of pathogenic challenge, the race-specific hypersensitive response (HR), it is now evident that NO also acts in the regulation of non-specific, papilla-based resistance to penetration by plant cells that survive attack and, possibly, in systemic acquired resistance. Equally, the potential roles of NO signalling/scavenging within the pathogen are being recognized. This review will consider key defensive roles played by NO in living cells during plant-pathogen interactions, as well as in those undergoing PCD.

Keywords: Defence; hypersensitive response; nitric oxide; plant-pathogen interactions; programmed cell death.
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