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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 (UGent), Kris Audenaert (UGent) and Monica Höfte (UGent)
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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.
Keywords
TRANSLOCATED SIGNAL, BIOCONTROL BACTERIA, GENE-EXPRESSION, INDUCTION, ARABIDOPSIS, CUCUMBER, FLUORESCENS, INFECTION, NECROSIS VIRUS, ACQUIRED-RESISTANCE, systemic acquired resistance, plant growth-promoting rhizobacteria

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Chicago
De Meyer, Geert, Kris Audenaert, and Monica Höfte. 1999. “Pseudomonas Aeruginosa 7NSK2-induced Systemic Resistance in Tobacco Depends on in Planta Salicylic Acid Accumulation but Is Not Associated with PR1a Expression.” European Journal of Plant Pathology 105 (5): 513–517.
APA
De Meyer, Geert, Audenaert, K., & Höfte, M. (1999). Pseudomonas aeruginosa 7NSK2-induced systemic resistance in tobacco depends on in planta salicylic acid accumulation but is not associated with PR1a expression. EUROPEAN JOURNAL OF PLANT PATHOLOGY, 105(5), 513–517.
Vancouver
1.
De Meyer G, Audenaert K, Höfte M. Pseudomonas aeruginosa 7NSK2-induced systemic resistance in tobacco depends on in planta salicylic acid accumulation but is not associated with PR1a expression. EUROPEAN JOURNAL OF PLANT PATHOLOGY. 1999;105(5):513–7.
MLA
De Meyer, Geert, Kris Audenaert, and Monica Höfte. “Pseudomonas Aeruginosa 7NSK2-induced Systemic Resistance in Tobacco Depends on in Planta Salicylic Acid Accumulation but Is Not Associated with PR1a Expression.” EUROPEAN JOURNAL OF PLANT PATHOLOGY 105.5 (1999): 513–517. Print.
@article{119927,
  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.},
  author       = {De Meyer, Geert and Audenaert, Kris and H{\"o}fte, Monica},
  issn         = {0929-1873},
  journal      = {EUROPEAN JOURNAL OF PLANT PATHOLOGY},
  keyword      = {TRANSLOCATED SIGNAL,BIOCONTROL BACTERIA,GENE-EXPRESSION,INDUCTION,ARABIDOPSIS,CUCUMBER,FLUORESCENS,INFECTION,NECROSIS VIRUS,ACQUIRED-RESISTANCE,systemic acquired resistance,plant growth-promoting rhizobacteria},
  language     = {eng},
  number       = {5},
  pages        = {513--517},
  title        = {Pseudomonas aeruginosa 7NSK2-induced systemic resistance in tobacco depends on in planta salicylic acid accumulation but is not associated with PR1a expression},
  url          = {http://dx.doi.org/10.1023/A:1008741015912},
  volume       = {105},
  year         = {1999},
}

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