ミハラマイシンAの植物ウイルスの増殖および発病に対する抑制効果

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Miharamycin A, a new antibiotic isolated from cultures of Streptomyces miharaensis nov. sp., has a contro1 effect on rice blast disease. It was also found to have a highly inhibitory effect on plant viruses. This antibiotic inhibited TMV-1oca1 1esion formation on detached Nicotiana glutinosa leaves above 90 percent at 2.5 μg/ml, and on the intact leaves 85 percent at 5 μg/ml, causing no chemica1 injury on leaves. It also inhibited CMV (Ye11ow strain)-1oca1 1esion formation on intact Nicotiana glutinosa and Chenopodium amaranticolor leaves 80-90 Per Cent at 10 μg/ml. Five μg/ml of Miharamycin A almost completely inhibited TMV multip1ication in tobaccoo 1eaf discs floated for 2 days on its solution. When floated for 8 days, its inhibition value reached 70 percent even at O.25 μg/ml. Moreover, when sprayed on inoculated tobacco plants 4 times, this antibiotic inhibited the rate of tobacco mosaic virus infection by more than 70 percent at 20 μg/ml, and pro1onged the incubation period more than 20 days compared with control plants. In the case of PVX-Nicotiana glutinosa plants, Miharamycin A inhibited the infection 50 percent at the same concentration. When app1ied to rice plant by dipping roots with 10 μg/ml for 40 hours, or 5 μg/ml for 80 hours, this antibiotic inhibited the rice stripe virus infection by 70-80 percent. Miharamycin A caused a chemica1 iniury on deve1oped leaves at above 10 μg/ml, but newly deve1oped leaves were not injured, and the plants grew norma11y.
日本植物病理学会の論文
1968-12-25

ミハラマイシンAの植物ウイルスの増殖および発病に対する抑制効果

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