Deficiency in phytoalexin production causes enhanced susceptibility of Arabidopsis thaliana to the fungus Alternaria brassicicola

The phytoalexin-deficient Arabidopsis mutant pad3-1, which is affected in the production of the indole-type phytoalexin camalexin, has previously been shown not to display altered susceptibility to either the bacterium Pseudomonas syringae (Glazebrook and Ausubel, 1994; Proc. Natl. Acad. Sci. USA, 9...

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Veröffentlicht in:	The Plant journal : for cell and molecular biology Jg. 19; H. 2; S. 163 - 171
Hauptverfasser:	Thomma, B.P.H.J, Nelissen, I, Eggermont, K, Broekaert, W.F
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Oxford, UK Blackwell Science Ltd 01.07.1999 Blackwell Science
Schlagworte:	Alternaria Alternaria - growth & development Alternaria brassicicola Anti-Infective Agents Anti-Infective Agents - metabolism Antifungal Agents Antifungal Agents - pharmacology Arabidopsis Arabidopsis - genetics Arabidopsis - metabolism Arabidopsis - microbiology Arabidopsis thaliana biochemical pathways Biological and medical sciences biological resistance biosynthesis Botrytis Botrytis - growth & development Cyclopentanes Cyclopentanes - pharmacology defense mechanisms Defensins disease resistance Disease Susceptibility ethylene Ethylenes Ethylenes - pharmacology Fundamental and applied biological sciences. Psychology Fungal plant pathogens gene expression Gene Expression Regulation, Plant genetics growth & development Indoles Indoles - metabolism jasmonic acid metabolism microbiology mutants Mutation Oxylipins Pathology, epidemiology, host-fungus relationships. Damages, economic importance pharmacology phytoalexins Phytopathology. Animal pests. Plant and forest protection Plant Diseases Plant Diseases - microbiology Plant Extracts Plant Extracts - metabolism Plant Growth Regulators Plant Growth Regulators - pharmacology Plant Proteins Plant Proteins - genetics salicylic acid Salicylic Acid - pharmacology Sesquiterpenes Terpenes Thiazoles Thiazoles - metabolism Plant pathogen Botrytis cinerea Alternaria brassicicola Ethylene Biosynthesis Antimicrobial agent Fungi Arabidopsis thaliana Regulation(control) Cruciferae Dicotyledones Angiospermae Fungi Imperfecti Thallophyta Terpenoid Salicylic acid Deficiency Host agent relation Sensitivity resistance Phytoalexin Defense mechanism Spermatophyta Models Mutation Experimental plant
ISSN:	0960-7412, 1365-313X
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Zusammenfassung:	The phytoalexin-deficient Arabidopsis mutant pad3-1, which is affected in the production of the indole-type phytoalexin camalexin, has previously been shown not to display altered susceptibility to either the bacterium Pseudomonas syringae (Glazebrook and Ausubel, 1994; Proc. Natl. Acad. Sci. USA, 91: 8955-8959) or the biotrophic fungi Peronospora parasitica (Glazebrook et al., 1997; Genetics, 146: 381-392) and Erysiphe orontii (Reuber et al., 1998; Plant J. 16: 473-485). We now show that this mutant is markedly more susceptible than its wild-type parental line to infection by the necrotrophic fungus Alternaria brassicicola, but not to Botrytis cinerea. A strong camalexin response was elicited in wild-type plants inoculated with either Alternaria brassicicola or Botrytis cinerea, whereas no camalexin could be detected in pad3-1 challenged with these fungi. Hence, PAD3 appears to be a key determinant in resistance to at least A. brassicicola. The induction of salicylate-dependent and jasmonate/ethylene-dependent defense genes was not reduced in Alternaria-challenged pad3-1 plants compared to similarly treated wild-type plants. Camalexin production could not be triggered by exogenous application of either salicylate, ethylene or jasmonate and was not, or not strongly, reduced in mutants with defects in perception of these defense-related signal molecules. Camalexin-production appears to be controlled by a pathway that exhibits little crosstalk with salicylate-, ethylene- and jasmonate-dependent signalling events.
Bibliographie:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0960-7412 1365-313X
DOI:	10.1046/j.1365-313X.1999.00513.x