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EnglishA new phytotoxic hexasubstituted pyranopyran, biscopyran, was isolated together with phenylacetic acid and previously isolated 5-methylmellein from the liq. culture filtrates of Biscogniauxia mediterranea, a major fungal pathogen involved in oak decline in Sardinia. Biscopyran was characterized by spectroscopic methods as a new (Z)-2-methoxy-1-[7-((Z)-2-methoxybut-2-enoyl)-3,4,5,6-tetramethyl-2H,7H-pyrano[2,3-b]pyran-2-yl]but-2-en-1-one. Biscopyran assayed at 0.26-0.026 mM concn. range caused epinasty on cork oak cuttings. On a nonhost plant, tomato, biscopyran caused wilting. Phenylacetic acid, assayed at the same concn., was toxic to Quercus suber, while on tomato cuttings it induced internal tissue collapse on the stem.
| Titolo: | Biscopyran, a phytotoxic hexasubstituted pyranopyran produced by Biscogniauxia mediterranea, a fungus pathogen of cork oak | |
| Autori: | ||
| Data di pubblicazione: | 2005 | |
| Rivista: | ||
| Abstract: | A new phytotoxic hexasubstituted pyranopyran, biscopyran, was isolated together with phenylacetic acid and previously isolated 5-methylmellein from the liq. culture filtrates of Biscogniauxia mediterranea, a major fungal pathogen involved in oak decline in Sardinia. Biscopyran was characterized by spectroscopic methods as a new (Z)-2-methoxy-1-[7-((Z)-2-methoxybut-2-enoyl)-3,4,5,6-tetramethyl-2H,7H-pyrano[2,3-b]pyran-2-yl]but-2-en-1-one. Biscopyran assayed at 0.26-0.026 mM concn. range caused epinasty on cork oak cuttings. On a nonhost plant, tomato, biscopyran caused wilting. Phenylacetic acid, assayed at the same concn., was toxic to Quercus suber, while on tomato cuttings it induced internal tissue collapse on the stem. | |
| Handle: | http://hdl.handle.net/11588/201116 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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