Degradation of aromatic compounds through the β-ketoadipate pathway is required for pathogenicity of the tomato wilt pathogenFusarium oxysporumf. sp.lycopersici
| Autor: | Martijn Rep, Claude Alabouvette, Linda Reijnen, Caroline B. Michielse, Chantal Olivain |
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| Rok vydání: | 2012 |
| Předmět: |
2. Zero hunger
Exudate Laccase 0303 health sciences biology 030306 microbiology Mutant food and beverages Soil Science Plant Science Fungi imperfecti biology.organism_classification Microbiology Cell wall 03 medical and health sciences chemistry.chemical_compound Fusarium oxysporum f.sp. lycopersici chemistry Fusarium oxysporum medicine Lignin medicine.symptom Agronomy and Crop Science Molecular Biology 030304 developmental biology |
| Zdroj: | Molecular Plant Pathology. 13:1089-1100 |
| ISSN: | 1464-6722 |
| Popis: | Plant roots react to pathogen attack by the activation of general and systemic resistance, including the lignification of cell walls and increased release of phenolic compounds in root exudate. Some fungi have the capacity to degrade lignin using ligninolytic extracellular peroxidases and laccases. Aromatic lignin breakdown products are further catabolized via the β-ketoadipate pathway. In this study, we investigated the role of 3-carboxy-cis,cis-muconate lactonizing enzyme (CMLE), an enzyme of the β-ketoadipate pathway, in the pathogenicity of Fusarium oxysporum f. sp. lycopersici towards its host, tomato. As expected, the cmle deletion mutant cannot catabolize phenolic compounds known to be degraded via the β-ketoadipate pathway. In addition, the mutant is impaired in root invasion and is nonpathogenic, even though it shows normal superficial root colonization. We hypothesize that the β-ketoadipate pathway in plant-pathogenic, soil-borne fungi is necessary to degrade phenolic compounds in root exudate and/or inside roots in order to establish disease. |
| Databáze: | OpenAIRE |
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