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Plant and Cell Physiology Advance Access published online on November 29, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm163
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Published by Oxford University Press on behalf of the Japanese Society of Plant Physiologists (JSPP)

Calcium Efflux as a Component of Hypersensitive Response of Nicotiana benthamiana to Pseudomonas syringae

Lev G Nemchinov1,*, Lana Shabala2 and Sergey Shabala2

1USDA/ARS, Plant Sciences Institute, Molecular Plant Pathology Laboratory, Beltsville MD 20705, USA.
2School of Agricultural Science, University of Tasmania, Private Bag 54, Hobart, Tas 7001, Australia.

Author for correspondence: Dr. Lev. G. Nemchinov, US Department of Agriculture, Plant Sciences Institute, Molecular Plant Pathology Laboratory, 10300 Baltimore Avenue, Bldg 004, Beltsville, MD 20705, USA. Telephone: 301-504-5099; Fax: 301-504-5449; E-mail: Lev.Nemchinov{at}ars.usda.gov.


  Abstract

Using a model plant Nicotiana benthamiana we have demonstrated that initial calcium uptake in response to HR (hypersensitive response)-causing pathogen, P. syringae pv syringae 61 is followed by the net calcium efflux initiated at about 12 hours after the bacterial challenge and sustained for at least 48 hours. Our data suggest that calcium acts not only 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 defense reaction. Accordingly, we suggest that the existing model of HR should be amended to include such Ca2+ pump.

Keywords: Calcium efflux - Hypersensitive response - Pseudomonas syringae

(Received October 11, 2007; Accepted November 19, 2007)
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