A putative role for fusaric acid in biocontrol of the parasitic angiosperm Orobanche ramosa
| Autor: | Anne Marie Pennarun, Ismaïl El Hadrami, Hayat El-Maarouf-Bouteau, M. Monestiez, Brahim Bouizgarne, François Bouteau, Yedir Ouhdouch, Bernadette Biligui, Jean Pierre Rona, Karine Madiona, Zahia Amiar |
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| Rok vydání: | 2006 |
| Předmět: |
Fusarium
Physiology Arabidopsis Gene Expression Germination Root hair Plant Roots chemistry.chemical_compound Arabidopsis thaliana Pest Control Biological biology Orobanche Jasmonic acid food and beverages General Medicine Membrane hyperpolarization Fusaric Acid biology.organism_classification chemistry Biochemistry Seedlings Agronomy and Crop Science Fusaric acid Salicylic acid Orobanche ramosa Signal Transduction |
| Zdroj: | Molecular plant-microbe interactions : MPMI. 19(5) |
| ISSN: | 0894-0282 |
| Popis: | Fusarium spp. are ubiquitous fungi found in soil worldwide as both pathogenic and nonpathogenic strains. The signals leading to disease or the absence of disease are poorly understood. We recently showed that fusaric acid (FA), a nonspecific toxin produced by most Fusarium spp., could elicit various plant defense responses at 100 nM without toxic effect. In this study, we checked for the effect of FA on root and root hairs, probable first site of contact between the fungi and the host. Large FA concentrations reduce root and root-hair growth and induce a rapid transient membrane hyperpolarization, followed by a large depolarization, due to the inhibition of H+-ATPase currents. Nanomolar concentrations of FA induced only an early transient membrane hyperpolarization of root hairs compatible with the induction of a signal transduction pathway. FA at 10-7 M failed to induce salicylic acid- and jasmonic acid/ethylene-dependent defense-related genes but inhibited the germination of the angiosperm parasite Orobanche ramosa in contact of FA-pretreated Arabidopsis thaliana seedlings. These data suggest that FA at nontoxic concentrations could activate signal transduction components necessary for plant-defense responses that could contribute to biocontrol activity of Fusarium spp. |
| Databáze: | OpenAIRE |
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