Journal Article

Ethylene Promotes the Necrotic Lesion Formation and Basic PR Gene Expression in TMV-Infected Tobacco

Norihiro Ohtsubo, Ichiro Mitsuhara, Masaaki Koga, Shigemi Seo and Yuko Ohashi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 40, issue 8, pages 808-817
Published in print January 1999 | ISSN: 0032-0781
Published online January 1999 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029609
Ethylene Promotes the Necrotic Lesion Formation and Basic PR Gene Expression in TMV-Infected Tobacco

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Ethylene has been thought to be an important factor for the induction of defense responses against pathogen attack, but its function in these responses has not been well defined. Here we show the direct involvement of ethylene in the formation of necrotic lesions and in basic pathogenesis-related (PR) protein gene induction in tobacco. Increase in ethylene production as well as accumulation of 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) gene transcript obviously preceded the lesion appearance in tobacco mosaic virus (TMV)-infected leaves in an N gene-dependent synchronous lesion formation system. Inhibitors of ethylene biosynthesis or action significantly suppressed both lesion formation and basic PR gene expression. Induction of these genes was enhanced in 1-aminocyclopropane-1-carboxylic acid (ACC)-treated leaves especially in ACO-overexpressing transgenic tobacco plants. Further, we found that ethylene production during hypersensitive reaction is restricted at the level of ACO activity.

Keywords: ACC oxidase; Basic PR genes; Ethylene; Hypersensitive reaction; Lesion formation; Transgenic tobacco plant

Journal Article.  0 words. 

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

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