Antifungal activities of actinomycete strains associated with high-altitude sagebrush rhizosphere |
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Authors: | A E Jiménez-Esquilín T M Roane |
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Institution: | (1) Department of Biology, University of Colorado, Campus Box 171, P.O. Box 173364, Denver, CO 80217-3364, USA |
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Abstract: | The antifungal-producing potential of actinomycete populations from the rhizosphere of low-altitude sagebrush, Artemisia tridentata, has been examined. In a continued investigation of new sources of antifungal-producing microorganisms, this study examined
the antifungal-producing potential of actinomycetes from the rhizosphere of high-altitude A. tridentata. With high-altitude sagebrush, rhizosphere soil actinomycete numbers were one to four orders of magnitude higher than those
found in nonrhizosphere bulk soils and different from those found with the low-altitude plants. A total of 122 actinomycete
isolates was screened against nine fungal species and six bacterial species for the production of antimicrobial compounds.
Four rhizosphere isolates, Streptomyces amakusaensis, S. coeruleorubidus, S. hawaiiensis and S. scabies, showed broad-spectrum antifungal activity against three or more fungal species in plate assays. In liquid antagonism assays,
mycelium production by Aspergillus niger was reduced by up to 50% by two of the actinomycete isolates. These results demonstrate the potential of rhizosphere microbiology
in the search for new antimicrobials. |
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Keywords: | Actinomycete Rhizosphere Sagebrush Antifungal Streptomyces |
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