Studies on Apple Canker Disease. The Necrotic Toxins Produced by Valsa ceratosperma
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概要
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Several metabolites responsible for the toxic manifestations of Valsa ceratosperma (Toda et Fries) Maire, a phytopathogenic fungus of the Japanese apple canker, have been isolated from its culture filtrate after growth on apple branch extract. Chemical and spectrometric studies revealed the products to be degradation products of phlorizin which is a dominant component distributed in leaves, stems, fruits and roots of apple. The toxic substances were identified as 3-(p-hydroxyphenyl) propionic acid, phloroglucinol, p-hydroxyacetophenone, p-hydroxybenzoic acid and protocatechuic acid. All of these compounds except p-hydroxyacetophenone were detected in the lesions of apple trees infected by V. ceratosperma. The fungus cultivated in a medium containing added phlorizin also produced the five toxic substances mentioned above. These results suggest that phlorizin is involved in the specific relationship between the host and the pathogen, indicating that the degradation products of phlorizin play important roles in the production of symptoms of infected apple trees.
- 社団法人 日本農芸化学会の論文
著者
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Otake Noboru
Institute Of Applied Microbiology The University Of Tokyo
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Seto Haruo
Institute Of Applied Microbiology The University Of Tokyo
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SETO Haruo
Institute of Applied Microbiology, The University of Tokyo
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NATSUME Hidehiko
Institute of Applied Microbiology, The University of Tokyo
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