Suppression by ABA of salicylic acid and lignin accumulation and the expression of multiple genes,in <Emphasis Type="Italic">Arabidopsis</Emphasis> infected with <Emphasis Type="Italic">Pseudomonas syringae</Emphasis> pv. <Emphasis Type="Italic">tomato</Emphasis> |
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Authors: | Peter G Mohr David M Cahill |
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Institution: | (1) School of Life and Environmental Sciences, Deakin University, Geelong campus at Waurn Ponds, Geelong, Victoria, 3217, Australia;(2) Present address: Department of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA |
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Abstract: | 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.
Electronic supplementary material Supplementary material is available in the online version of this article at and is accessible for authorized users. |
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Keywords: | ABA Microarray Disease resistance Arabidopsis thaliana Salicylic acid Lignin |
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