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Suppression by abscisic acid of lignin production and monolignol pathway gene expression in interactions of Arabidopsis with oomycete and bacterial pathogens

Mohr, P. and Cahill, D. 2004, Suppression by abscisic acid of lignin production and monolignol pathway gene expression in interactions of Arabidopsis with oomycete and bacterial pathogens, in Phytopathology : Abstracts of the American Society of Plant Biologists Annual Meeting, American Society of Plant Biologists, St. Paul, Minn., pp. 72-72.

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Title Suppression by abscisic acid of lignin production and monolignol pathway gene expression in interactions of Arabidopsis with oomycete and bacterial pathogens
Author(s) Mohr, P.
Cahill, D.
Conference name American Society of Plant Biologists Annual Meeting (2004 : Anaheim, Calif.)
Conference location Anaheim, Calif.
Conference dates 31 Jul.-4 Aug. 2004
Title of proceedings Phytopathology : Abstracts of the American Society of Plant Biologists Annual Meeting
Publication date 2004
Start page 72
End page 72
Publisher American Society of Plant Biologists
Place of publication St. Paul, Minn.
Summary The phytohormone, abscisic acid (ABA) has been shown to influence the outcome of the interactions between various hosts with biotrophic and hemibiotrophic pathogens. Susceptibility to avirulent isolates can be induced in plants by addition of low physiological concentrations of ABA. In contrast, addition of ABA biosynthesis inhibitors induced resistance following challenge of plants by virulent isolates. ABA deficient mutants of Arabidopsis, such as aba1-1, were resistant to virulent isolates of Peronospora parasitica. In interactions of Arabidopsis with avirulent isolates of Pseudomonas syringae pv. tomato, susceptibility was induced following addition of ABA or imposition of drought stress. These results indicate a pivotal, albiet undefined, role for ABA in determining either susceptibility or resistance to pathogen attack. We have found that the production of the cell wall strengthening compound, lignin, is increased during resistant interactions of aba1-1 but suppressed in ABA-induced susceptible interactions. Using RT-PCR and microarray analysis we have found down-regulation by ABA of key genes of the phenylpropanoid pathway especially of those genes involved directly in lignin biosynthesis. ABA also down-regulates a number of genes in other functional classes including those involved in defence and cell signalling.
Notes Reproduced with the kind permission of the copyright owner.
ISBN 0031-949X
Language eng
Field of Research 060704 Plant Pathology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category E3 Extract of paper
Copyright notice ©2004, American Society of Plant Biologists
Persistent URL http://hdl.handle.net/10536/DRO/DU:30014221

Document type: Conference Paper
Collections: School of Biological and Chemical Sciences
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