Abscisic acid influences the susceptibility of Arabidopsis thaliana to Pseudomonas syringae pv. tomato and Peronospora parasitica

Mohr, Peter G. and Cahill, David 2003, Abscisic acid influences the susceptibility of Arabidopsis thaliana to Pseudomonas syringae pv. tomato and Peronospora parasitica, Functional plant biology, vol. 30, no. 4, pp. 461-469.

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Title Abscisic acid influences the susceptibility of Arabidopsis thaliana to Pseudomonas syringae pv. tomato and Peronospora parasitica
Author(s) Mohr, Peter G.
Cahill, David
Journal name Functional plant biology
Volume number 30
Issue number 4
Start page 461
End page 469
Publisher CSIRO Publishing
Place of publication Collingwood, Vic.
Publication date 2003
ISSN 1445-4408
1445-4416
Summary The phytohormone abscisic acid (ABA) plays a major role in the regulation of many physiological stresses although its role in pathogen-induced stress remains poorly understood. We examined the influence of ABA on interactions of Arabidopsis thaliana (L.) Heynh. (Arabidopsis) with a bacterial pathogen, Pseudomonas syringae pv. tomato and an Oomycete, Peronospora parasitica. Both addition of 100 μM ABA to plants and drought stress stimulated increased susceptibility of Arabidopsis to an avirulent isolate of P. syringae pv. tomato. In contrast, an ABA-deficient mutant of Arabidopsis, aba1-1, displayed reduced susceptibility to virulent isolates of P. parasitica. An ABA-insensitive mutant, abi1-1, that is impaired in ABA signal transduction did not alter in susceptibility to either P. syringae pv. tomato or P. parasitica. These results demonstrate that the concentration of endogenous ABA at the time of pathogen challenge is important for the development of susceptibility in Arabidopsis.
Language eng
Field of Research 060704 Plant Pathology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2003, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30001993

Document type: Journal Article
Collection: School of Biological and Chemical Sciences
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