Degradation of the pterocarpan phytoalexin medicarpin by Ascochyta rabiei
| Autor: | D. Stöckl, L. Schwenen, B. Kraft, Wolfgang Barz |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
0106 biological sciences
chemistry.chemical_classification 0303 health sciences Catabolism Phytoalexin Pterocarpan Catabolite repression General Medicine Fungus Biology biology.organism_classification 01 natural sciences Biochemistry Microbiology 03 medical and health sciences chemistry.chemical_compound chemistry Genetics Degradation (geology) Medicarpin Molecular Biology Mycelium 030304 developmental biology 010606 plant biology & botany |
| Zdroj: | Archives of Microbiology. 147:201-206 |
| ISSN: | 1432-072X 0302-8933 |
| DOI: | 10.1007/bf00415285 |
| Popis: | Four strains of Ascochyta rabiei pathogenic to chickpea (Cicer arietinum L.) were shown to efficiently degrade medicarpin (3-hydroxy-9-methoxypterocarpan), the main phytoalexin of this plant. Degradative studies were performed with mycelium preparations or with crude protein extracts of the fungus. Isolation and structural elucidation of 10 catabolites by chromatographic and spectroscopic techniques revealed that medicarpin degradation involves 1. reductive conversion to a 2′-hydroxyisoflavan, 2. O-demethylation, 3. aromatic hydroxylation in ring A and 4. formation of a 1a-hydroxy-pterocarp-1,4-diene-3-one. As terminal aromatic catabolite 2,4-dihydroxybenzoic acid was found. A catabolic sequence for medicarpin is postulated and the results are discussed with regard to pterocarpan dissimilation by other phytopathogenic fungi. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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