European Journal of Plant Pathology

, Volume 105, Issue 5, pp 513–517

Pseudomonas aeruginosa 7NSK2-induced Systemic Resistance in Tobacco Depends on in planta Salicylic Acid Accumulation but is not Associated with PR1a Expression

  • Geert De Meyer
  • Kris Audenaert
  • Monica Höfte
Article

DOI: 10.1023/A:1008741015912

Cite this article as:
De Meyer, G., Audenaert, K. & Höfte, M. European Journal of Plant Pathology (1999) 105: 513. doi:10.1023/A:1008741015912

Abstract

Root colonization by rhizobacteria can induce a systemic resistance in plants that is phenotypically similar to systemic acquired resistance induced by a localized pathogen infection. We used the tobacco–tobacco mosaic virus model to investigate whether the systemic resistance induced by the rhizobacterium Pseudomonas aeruginosa 7NSK2 is mediated by the systemic acquired resistance signal transduction pathway. Experiments with nahG-transformed tobacco revealed that Pseudomonas aeruginosa 7NSK2-induced resistance depended on in planta salicylic acid accumulation for its expression but not for its induction and is, in this respect, similar to systemic acquired resistance. However, Pseudomonas aeruginosa 7NSK2-induced resistance was, unlike systemic acquired resistance, not associated with PR1a expression at the time of challenge with tobacco mosaic virus. This suggests that Pseudomonas aeruginosa 7NSK2 treatment would only potentiate defense gene expression in systemic tissue, which would also explain why its level of resistance is lower than in case of systemic acquired resistance. Because we demonstrated that induced resistance by Pseudomonas aeruginosa 7NSK2 exclusively depends on the production of salicylic acid by this strain our conclusions might also account for other salicylic acid-producing and resistance-inducing rhizobacteria.

plant growth-promoting rhizobacteria systemic acquired resistance 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Geert De Meyer
    • 1
  • Kris Audenaert
    • 1
  • Monica Höfte
    • 1
  1. 1.Laboratory of Phytopathology, Faculty of Agricultural and Applied Biological SciencesUniversity GentGentBelgium

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