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JXB Advance Access originally published online on December 23, 2005
Journal of Experimental Botany 2006 57(3):489-505; 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

FOCUS PAPER

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

Luis A. J. Mur1,*, Tim L. W. Carver2 and Elena Prats3

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

* To whom correspondence should be addressed. E-mail: lum{at}aber.ac.uk

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.

Key words: Defence, hypersensitive response, nitric oxide, plant–pathogen interactions, programmed cell death


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