Specific inhibition of spore germination of <Emphasis Type="Italic">Alternaria brassicicola</Emphasis> by fistupyrone from <Emphasis Type="Italic">Streptomyces</Emphasis> sp. TP-A0569 |
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| Authors: | Evelyn Aigho?Aremu Tamotsu?Furumai Yasuhiro?Igarashi Yukio?Sato Hajime?Akamatsu Motoichiro?Kodama Email author" target="_blank">Hiroshi?OtaniEmail author |
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| Institution: | (1) The United Graduate School of Agricultural Sciences, Laboratory of Plant Pathology, Tottori University, Tottori, Japan;(2) Biotechnology Research Center, Toyama Prefecture University, Toyama, Japan;(3) College of Technology, Toyama Prefecture University, Toyama, Japan;(4) Faculty of Agriculture, Tottori University, Tottori, 680-8553, Japan |
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| Abstract: | Fistupyrone (FP), a metabolite from Streptomyces sp. TP-A0569, inhibited the in vivo infection of Chinese cabbage seedlings by Alternaria brassicicola. To detect the possible action sites of FP, the effect of FP on the infection behavior of A. brassicicola and A. alternata was investigated. When spores of A. brassicicola were suspended in FP solution and inoculated on host leaves, FP at 0.1 ppm significantly inhibited spore germination, appressorial formation, and infection hypha formation of A. brassicicola. Host-specific AB-toxin production and lesion formation by A. brassicicola spores were also reduced significantly by treatment with FP 1ppm. The effect of FP seemed to be irreversible because significant washing of FP-treated spores with distilled water (DW) did not change the inhibitory effects. In contrast, A. alternata isolates such as Japanese pear pathotype, apple pathotype, and saprophyte behaved almost equally in both FP- and DW-treated spores. Mycelial dry weight in potato dextrose broth and mycelial diameters on potato dextrose agar, gelatin glucose agar, and Czapek solution agar of both A. brassicicola and A. alternata were not different with or without addition of FP. These results indicate that FP at low concentrations has a fungicidal effect on spores of A. brassicicola but not on spores of A. alternata; FP also does not affect the vegetative phase of these fungi. |
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| Keywords: | Fistupyrone Streptomyces sp Alternaria brassicicola Alternaria alternata Spore germination Mycelial growth |
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