Journal article
Defence signalling pathways involved in plant resistance and phosphite-mediated control of Phytophthora cinnamomi
Plant Molecular Biology Reporter, Vol.32(2), pp.342-356
2014
Abstract
Phytophthora cinnamomi is one of the most devastating plant pathogens worldwide. Current control of P. cinnamomi in natural ecosystems primarily relies on chemical phosphite (Phi). To investigate host- and Phi-mediated resistance, A. thaliana ecotypes and mutants defective in salicylic acid (SA), jasmonic acid (JA), ethylene (ET) and abscisic acid (ABA) signalling pathways were screened for susceptibility to P. cinnamomi. In contrast to Col-0, the aba2-4 mutant, deficient in the synthesis of ABA, was susceptible suggesting a role for ABA in resistance to P. cinnamomi. Phi treatment increased resistance in aba2-4, but not to the level of Col-0, suggesting that Phi may act through both ABA-dependent and ABA-independent pathways. Phi treatment or P. cinnamomi inoculation of Col-0 down-regulated AtMYC2, a positive regulator of ABA signalling, which negatively regulates JA/ET-related pathogenesis-related genes, such as PDF1. 2, whilst positively regulating JA-mediated herbivore responses such as VSP and PI. Consistent with this, P. cinnamomi or Phi treatment caused up-regulation of PDF1. 2 and THI2. 1 and down-regulation of VSP2 and the ABA-responsive gene RD22. Despite the up-regulation of JA/ET-dependent defence genes, the JA-defective mutant, jar1-1 and ET-defective mutants, ein2-1 and etr1-3, showed wild-type levels of resistance to P. cinnamomi, suggesting that these JA/ET defences are not required for resistance to P. cinnamomi. These results suggest that the resistance response of Col-0 act, at least in part, through a mechanism dependent on ABA synthesis, which appears independent of the interaction between ABA and elements of the JA/ET pathway, whilst Phi-mediated resistance, although inducing a response resembling the resistance response of Col-0, is independent of ABA signalling.
Details
- Title
- Defence signalling pathways involved in plant resistance and phosphite-mediated control of Phytophthora cinnamomi
- Authors/Creators
- L. Eshraghi (Author/Creator) - Murdoch UniversityJ.P. Anderson (Author/Creator) - The University of Western AustraliaN. Aryamanesh (Author/Creator) - The University of Western AustraliaJ.A. McComb (Author/Creator) - Murdoch UniversityB. Shearer (Author/Creator) - Murdoch UniversityG.E.St.J. Hardy (Author/Creator) - Murdoch University
- Publication Details
- Plant Molecular Biology Reporter, Vol.32(2), pp.342-356
- Publisher
- Springer New York
- Identifiers
- 991005544124907891
- Copyright
- © 2013 Springer Science+Business Media New York.
- Murdoch Affiliation
- School of Veterinary and Life Sciences; Centre for Phytophthora Science and Management
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.4 Crop Science
- 3.4.419 Jasmonic Acid
- Web Of Science research areas
- Biochemical Research Methods
- Plant Sciences
- ESI research areas
- Plant & Animal Science