85 トウモロコシの病原菌B. zeicola race 3が生産する宿主特異的BZR-毒素群の構造(口頭発表の部)

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B. zeicola is the pathogen of leaf spot of corn. Their pathogenic races of the fungus have been differentiated according to the symptoms expressed on different corn genotype. Race 1 produces host-specific HC-toxin (Table 1). B. zeicola race 3 also exhibits high pathogenicity to rice plants by artificial inoculation. The spore-germination fluids of race 3 showed susceptibility-inducing activity on rice and corn leaves to nonpathogenic fungus. In 1990 Nishimura et al. isolated BZR-toxins as susceptibility-inducing factor produced by B. zeicola race 3. The factor consist of 4 components which are called B1, B2, B3, and B4. While each component showed little toxicity, their combinations exhibited potent phytotoxicity and susceptibility-inducing activity on rice plants (Fig. 1). We undertook the structural study of BZR-toxins to make clear the interesting phenomenon chemically. The ^1H-NMR spectra of each component revealed the presence of N-methyl-α-aminoacids residue in their structure. Their molecular weight were determined by the SIMS spectra (B1: 967, B2: 964, B3: 907). And the IR spectra showed adsorption based on amide C=O groups, ester C=O groups, amide NH groups and OH groups. Some hydrolyzed products of each component gave positive ninhydrin tests. Analysis of these results and the structures of partially hydrolysed products of each component (Scheme 1, 2, 3) elcidated the plane structures of the components as being cyclic depsipeptides shown in Fig. 3.
天然有機化合物討論会の論文
1991-09-07

85 トウモロコシの病原菌B. zeicola race 3が生産する宿主特異的BZR-毒素群の構造(口頭発表の部)

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