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Salicylic acid mediates resistance to the vascular wilt pathogen Fusarium oxysporum in the model host Arabidopsis thaliana

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Abstract

Fusarium oxysporum is a soilborne fungal pathogen that causes major economic losses by inducing necrosis and wilting symptoms in many crop plants. In this study, the interaction between F. oxysporum and the model plant Arabidopsis thaliana has been investigated to better understand the nature of host defences that are effective against the Fusarium wilt pathogen. The expression of salicylate- and jasmonate-responsive defence genes in F. oxysporum-challenged roots of A. thaliana plants as well as in the roots of plants whose leaves were treated with salicylate or jasmonate was analysed. Unexpectedly, genes (e.g. PR1, PDF1.2, and CHIB) encoding proteins with defensive functions or transcription factors (e.g. ERF1, AtERF2, AtERF4 and AtMYC2) known to positively or negatively regulate defences against F. oxysporum were not activated in F. oxysporum-inoculated roots. In contrast, the jasmonate-responsive defence gene PDF1.2 was induced in the leaves of plants whose roots were challenged with F. oxysporum, but the salicylate-responsive PR1 gene was not induced in the leaves of inoculated plants. Exogenous salicylic acid treatment prior to inoculation, however, activated PR1 and BGL2 defence gene expression in leaves and provided increased F. oxysporum resistance as evidenced by reduced foliar necrosis and plant death. Exogenous salicylic acid treatment of the foliar tissue did not activate defence gene expression in the roots of plants. This suggests that salicylate-dependent defences may function in foliar tissue to reduce the development of pathogen-induced wilting and necrosis. Despite the induction of defence gene expression in the leaves by jasmonate, this treatment did not lead to increased resistance to F. oxysporum. Overall, the results presented here suggest that the genetic manipulation of plant defence signalling pathways is a useful strategy to provide increased Fusarium wilt resistance.

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Authors and Affiliations

  1. Cooperative Research Centre for Tropical Plant Protection, The University of Queensland, John Hines Building Level 5, 4072, St Lucia, Qld, Australia

    C. I. Edgar, K. C. McGrath, J. M. Manners, D. C. Maclean, P. M. Schenk & K. Kazan

  2. CSIRO Plant Industry, Queensland Bioscience Precinct, 306 Carmody Road, 4067, St Lucia, Qld, Australia

    C. I. Edgar, K. C. McGrath, B. Dombrecht, J. M. Manners, D. C. Maclean & K. Kazan

  3. School of Molecular and Microbial Sciences, The University of Queensland, St Lucia, Qld, 4072, Australia

    K. C. McGrath & D. C. Maclean

  4. School of Integrative Biology, The University of Queensland, 4072, St Lucia, Qld, Australia

    P. M. Schenk

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  1. C. I. Edgar
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  2. K. C. McGrath
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  3. B. Dombrecht
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  4. J. M. Manners
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  7. K. Kazan
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Correspondence to K. Kazan.

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Edgar, C.I., McGrath, K.C., Dombrecht, B. et al. Salicylic acid mediates resistance to the vascular wilt pathogen Fusarium oxysporum in the model host Arabidopsis thaliana . Australasian Plant Pathology 35, 581–591 (2006). https://doi.org/10.1071/AP06060

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  • DOI: https://doi.org/10.1071/AP06060

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