Journal Article

Nitric oxide function and signalling in plant disease resistance

Jeum Kyu Hong, Byung-Wook Yun, Jeong-Gu Kang, Muhammad Usman Raja, Eunjung Kwon, Kirsti Sorhagen, Chengcai Chu, Yiqin Wang and Gary J. Loake

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 59, issue 2, pages 147-154
Published in print February 2008 | ISSN: 0022-0957
Published online November 2007 | e-ISSN: 1460-2431 | DOI: https://dx.doi.org/10.1093/jxb/erm244
Nitric oxide function and signalling in plant disease resistance

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Nitric oxide (NO) is one of only a handful of gaseous signalling molecules. Its discovery as the endothelium-derived relaxing factor (EDRF) by Ignarro revolutionized how NO and cognate reactive nitrogen intermediates, which were previously considered to be toxic molecules, are viewed. NO is now emerging as a key signalling molecule in plants, where it orchestrates a plethora of cellular activities associated with growth, development, and environmental interactions. Prominent among these is its function in plant hypersensitive cell death and disease resistance. While a number of sources for NO biosynthesis have been proposed, robust and biologically relevant routes for NO production largely remain to be defined. To elaborate cell death during an incompatible plant–pathogen interaction NO functions in combination with reactive oxygen intermediates. Furthermore, NO has been shown to regulate the activity of metacaspases, evolutionary conserved proteases that may be intimately associated with pathogen-triggered cell death. NO is also thought to function in multiple modes of plant disease resistance by regulating, through S-nitrosylation, multiple nodes of the salicylic acid (SA) signalling pathway. These findings underscore the key role of NO in plant–pathogen interactions.

Keywords: Hypersensitive response; nitric oxide; plant disease resistance; S-nitrosylation; S-nitrosothiols

Journal Article.  4783 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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