(7)Inhibitory Effect of Fistupyrone on Alternaria brassicicola and A. alternata Isolates

概要

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In previous studies we revealed that fistupyrone (FP) from Streptomyces sp. inhibited at low concentration spore germination of Alternaria brassicicola. To further detect possible action sites of FP, the infection behavior of A. brassicicola isolates from different fields and pathotypes of A. alternata was investigated. When spores of A. brassicicola and A. alternata isolates were suspended in FP solution and inoculated on respective host leaves, FP at 0.1 ppm inhibited significantly spore germination of A. brassicicola isolates. Pathogenicity and host-specific toxin production of A. brassicicola spores were also reduced significantly by treatment with 1 ppm FP. Mycelial growth of A. brassicicola and A. alternate on culture media containing FP were not different from control. FP-treated ungerminating spores of A. brassicicola washed with DW and dropped on host leaves, still did not germinate. These results indicate that FP affects directly spores of A. brassicicola, but not A. alternata.
日本植物病理学会の論文
2003-02-25