Actinomycetes isolated from medicinal plant rhizosphere soils: diversity and screening of antifungal compounds,indole-3-acetic acid and siderophore production |
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Authors: | Sutthinan Khamna Akira Yokota Saisamorn Lumyong |
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Institution: | (1) Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand;(2) Institute of Molecular and Cellular Biosciences, The University of Tokyo, Tokyo, Japan |
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Abstract: | A total of 445 actinomycete isolates were obtained from 16 medicinal plant rhizosphere soils. Morphological and chemotaxonomic
studies indicated that 89% of the isolates belonged to the genus Streptomyces, 11% were non-Streptomycetes: Actinomadura sp., Microbispora sp., Micromonospora sp., Nocardia sp, Nonomurea sp. and three isolates were unclassified. The highest number and diversity of actinomycetes were isolated from Curcuma mangga rhizosphere soil. Twenty-three Streptomyces isolates showed activity against at least one of the five phytopathogenic fungi: Alternaria brassicicola, Collectotrichum gloeosporioides, Fusarium oxysporum, Penicillium digitatum and Sclerotium
rolfsii. Thirty-six actinomycete isolates showed abilities to produce indole-3-acetic acid (IAA) and 75 isolates produced siderophores
on chrome azurol S (CAS) agar. Streptomyces CMU-PA101 and Streptomyces CMU-SK126 had high ability to produced antifungal compounds, IAA and siderophores. |
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Keywords: | Actinomycetes Antagonistic Indole-3-acetic acid Siderophores Biocontrol |
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