P-10 植物病原菌Bipolaris cynodontisの生産するテルペノイド系植物毒素の単離と構造決定(ポスター発表の部)

概要

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In order to search for the putative chemical factor(s) that may be responsible for the pathogenicity of Bipolaris cynodontis, a leaf-blight causing fungal pathogen of gramineous plants, phytotoxic metabolites were isolated from the culture with the guidance by the inhibitory activity against the root growth of the host plant seedlings such as ryegrass and rice plant. A total of 12 phytotoxins were obtained, and their structures were elucidated on the basis of MS, UV, IR, ^1H- and ^<13>C-NMR spectroscopic studies. Among them were 9 cochlioquinone congeners and 2 isocochlioquinone congeners, some of which have been isolated as phytotoxins from the fungal cultures of the same or close genera. Another toxin was a desacetyl analog of proliferin, a bicyclic sesterterpene with an unusual 15-membered ring, that have been isolated from Fusarium proliferatum. Its detailed NOE analyses as well as the interpretation of the ^<13>C-NMR spectrum suggested that the structure of proliferin proposed before should be partly corrected.
天然有機化合物討論会の論文
1995-09-01