Correlation between Production of Antifungal Metabolites by Streptomyces sp. 39L40C and Disease Suppressive Effect to Mulberry Twig Blight

Kentaro Ikeda; Hideki Saito; Shun-ichi Sato; Masashi Fujinaga; Seiji Chino; Shingo Oyamada; Shigeru Shoumura

doi:10.11416/jibs.73.95

Regular Articles

Correlation between Production of Antifungal Metabolites by Streptomyces sp. 39L40C and Disease Suppressive Effect to Mulberry Twig Blight

Kentaro Ikeda, Hideki Saito, Shun-ichi Sato, Masashi Fujinaga, Seiji Chino, Shingo Oyamada, Shigeru Shoumura

著者情報

キーワード: Biological control, Fusarium lateritium f. sp. mori, mulberry, twig blight, Streptomyces sp., mutant

ジャーナルフリー

2004 年 73 巻 2 号 p. 95-100

DOI https://doi.org/10.11416/jibs.73.95

詳細

抄録

The correlation between antifungal metabolites produced by Streptomyces sp. 39L40C and its disease suppressive effect was studied. Mutants of strain 39L40C showing non-antagonism to a mulberry twig blight pathogen, Fusarium lataritium f. sp. mori (FL), were induced by ultraviolet irradiation. Forty-three strains were isolated as candidates. Among them, two strains (100s-19, 15m-1) did not show antifungal activity with not only plate assay but also the culture filtrate assay. Disease suppression by these mutants and the wild strain 39L40C was examined with inoculation tests using spring pruning branches of mulberry. As a result, strain 100s-19 and strain 15m-1 showed suppression to mulberry twig blight in the case of 2.0×10⁴, 2.0×10⁵cells/ml FL concentration. However, both strains were not able to suppress twig blight at an FL concentration of 2.0×10⁶ cells/ml. These results showed that the disease suppressive effect of strain 39L40C was attributed to the antifungal metabolites.

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