Studies on the microbial populations of the rhizosphere of big sagebrush ( Artemisia tridentata)

Journal of Industrial Microbiology & Biotechnology
Antony J BasilDon L Crawford

Abstract

Prolonged use of broad-spectrum antibiotics has led to the emergence of drug-resistant pathogens, both in medicine and in agriculture. New threats such as biological warfare have increased the need for novel and efficacious antimicrobial agents. Natural habitats not previously examined as sources of novel antibiotic-producing microorganisms still exist. One such habitat is the rhizosphere of desert shrubs. Here, we show that one desert shrub habitat, the rhizosphere of desert big sagebrush ( Artemisia tridentata) is a source of actinomycetes capable of producing an extensive array of antifungal metabolites. Culturable microbial populations from both the sagebrush rhizosphere and nearby bulk soils from three different sites were enumerated and compared, using traditional plate-count techniques and antibiotic activity bioassays. There were no statistical differences between the relative numbers of culturable non-actinomycete eubacteria, actinomycetes and fungi in the rhizosphere versus bulk soils, but PCR amplification of the 16S rRNA gene sequences of the total soil DNA and denaturing gradient gel electrophoresis showed that the community structure was different between the rhizosphere and the bulk soils. A high percentage of ac...Continue Reading

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Citations

Jul 27, 2005·Journal of Industrial Microbiology & Biotechnology·A E Jiménez-Esquilín, T M Roane
Nov 22, 2015·Environmental Science and Pollution Research International·Luigi ChessaMaria Vittoria Pinna
Jul 14, 2016·Microbial Ecology·Milko A JorqueraMaría de La Luz Mora
Mar 9, 2017·The Journal of Antibiotics·Atsuko Matsumoto, Yōko Takahashi
Sep 25, 2017·Journal of Basic Microbiology·María Z Simon SolaAnalia Alvarez
Sep 21, 2006·Cell Biochemistry and Function·Mehlika BenliNazife Yigit
Jun 6, 2020·Biology·Elisa GamaleroGuido Lingua

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