Suppression by ABA of salicylic acid and lignin accumulation and the expression of multiple genes, in Arabidopsis infected with Pseudomonas syringae pv. tomato

Mohr, Peter G. and Cahill, David 2007, Suppression by ABA of salicylic acid and lignin accumulation and the expression of multiple genes, in Arabidopsis infected with Pseudomonas syringae pv. tomato, Functional & integrative genomics, vol. 7, no. 3, pp. 181-191.

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Title Suppression by ABA of salicylic acid and lignin accumulation and the expression of multiple genes, in Arabidopsis infected with Pseudomonas syringae pv. tomato
Author(s) Mohr, Peter G.
Cahill, David
Journal name Functional & integrative genomics
Volume number 7
Issue number 3
Start page 181
End page 191
Publisher Springer
Place of publication Berlin , Germany
Publication date 2007-07
ISSN 1438-793X
1438-7948
Keyword(s) ABA
microarray
disease resistance
arabidopsis thaliana
salicylic acid
lignin
Summary Abscisic acid (ABA) has been implicated in determining the outcome of interactions between many plants and their pathogens. We had previously shown that increased concentrations of ABA within leaves of Arabidopsis induced susceptibility towards an avirulent strain of Pseudomonas syringae pathovar (pv.) tomato. We now show that ABA induces susceptibility via suppression of the accumulation of components crucial for a resistance response. Lignin and salicylic acid concentrations in leaves were increased during a resistant interaction but reduced when plants were treated with ABA. The reduction in lignin and salicylic acid production was independent of the development of the hypersensitive response (HR), indicating that, in this host-pathogen system, HR is not required for resistance. Genome-wide gene expression analysis using microarrays showed that treatment with ABA suppressed the expression of many defence-related genes, including those important for phenylpropanoid biosynthesis and those encoding resistance-related proteins. Together, these results show that resistance induction in Arabidopsis to an avirulent strain of P. syringae pv. tomato is regulated by ABA.
Language eng
Field of Research 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2006, Springer-Verlag
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007745

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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