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Endogenous Methyl Salicylate in Pathogen-Inoculated Tobacco Plants1

Mirjana Seskar, Vladimir Shulaev, and Ilya Raskin*

AgBiotech Center, Cook College, Rutgers University, P.O. Box 231, New Brunswick, New Jersey 08903-0231

The tobacco (Nicotiana tabacum) cultivar Xanthi-nc (genotype NN) produces high levels of salicylic acid (SA) after inoculation with the tobacco mosaic virus (TMV). Gaseous methyl salicylate (MeSA), a major volatile produced in TMV-inoculated tobacco plants, was recently shown to be an airborne defense signal. Using an assay developed to measure the MeSA present in tissue, we have shown that in TMV-inoculated tobacco plants the level of MeSA increases dramatically, paralleling increases in SA. MeSA accumulation was also observed in upper, noninoculated leaves. In TMV-inoculated tobacco shifted from 32 to 24°C, the MeSA concentration increased from nondetectable levels to 2318 ng/g fresh weight 12 h after the temperature shift, but subsequently decreased with the onset of the hypersensitive response. Similar results were observed in plants inoculated with Pseudomonas syringae pathovar phaseolicola, in which MeSA levels were highest just before the hypersensitive response-induced tissue desiccation. Transgenic NahG plants unable to accumulate SA also did not accumulate MeSA after TMV inoculation, and did not show increased resistance to TMV following MeSA treatment. Based on the spatial and temporal kinetics of its accumulation, we conclude that tissue MeSA may play a role similar to that of volatile MeSA in the pathogen-induced defense response.

1   This research was funded by grant no. 96-35304-3874 from the U.S. Department of Agriculture. Additional support was provided by the New Jersey Agricultural Experiment Station and the New Jersey Commission for Science and Technology.
*   Corresponding author; e-mail raskin{at}aesop.rutgers.edu; fax 1-908-932-6535.

Plant Physiol. (1998) 116: 387-392
Copyright Clearance Center:   0032-0889/98/116/0387/06
© 1998 American Society of Plant Physiologists




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