Isolation of Actinomycetes from Live Plants and Evaluation of Antiphytopathogenic Activity of Their Metabolites

Yasuhiro Igarashi; Takako Iida; Tomomitsu Sasaki; Noriko Saito; Ryuji Yoshida; Tamotsu Furumai

doi:10.3209/saj.16_9

Original Articles

Isolation of Actinomycetes from Live Plants and Evaluation of Antiphytopathogenic Activity of Their Metabolites

Yasuhiro Igarashi, Takako Iida, Tomomitsu Sasaki, Noriko Saito, Ryuji Yoshida, Tamotsu Furumai

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JOURNAL FREE ACCESS

2002 Volume 16 Issue 1 Pages 9-13

DOI https://doi.org/10.3209/saj.16_9

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Abstract

Actinomycetes were isolated from live plants collected in Toyama and Miyagi prefectures, Japan. Three hundred and ninety eight actinomycete strains were obtained from the leaves, stems and roots of 11 harbaceous and 13 arbor plants of agricultural and wild species. n-Butanol extracts of the fermentation broths of these strains were screened for antiphytopathogenic activity using in vitro antimicrobial and in vivo antiinfective assays. About 10–20% of the extracts showed antagonistic activity against fungal or bacterial plant pathogens. In addition, several extracts suppressed the infection of Alternaria brassicicola TP-F0423, a fungal pathogen to seedlings of Chinese cabbages in vivo.

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