Journal Article

Calcium Efflux as a Component of the Hypersensitive Response of <i>Nicotiana benthamiana</i> to <i>Pseudomonas syringae</i>

Lev G. Nemchinov, Lana Shabala and Sergey Shabala

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 1, pages 40-46
Published in print January 2008 | ISSN: 0032-0781
Published online January 2008 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcm163
Calcium Efflux as a Component of the Hypersensitive Response of Nicotiana benthamiana to Pseudomonas syringae

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Using a model plant Nicotiana benthamiana, we have demonstrated that initial calcium uptake in response to the HR (hypersensitive response)-causing pathogen Pseudomonas syringae pv syringae 61 is followed by net calcium efflux initiated at about 12 h after the bacterial challenge and sustained for at least 48 h. Our data suggest that calcium not only acts as an important second messenger in the activation of resistance responses but may also be a downstream mediator of later cell death acceleration and completion of the defense reaction. Accordingly, we propose that the existing model of HR should be amended to include a PM Ca2+ ATP pump as an important component of the HR to pathogens in plants.

Keywords: Calcium efflux; Hypersensitive response; Pseudomonas syringae

Journal Article.  3877 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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