Preliminary characterization of some streptomyces species from four Tanzanian soils and their antimicrobial potential against selected plant and animal pathogenic bacteria
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Date
2000-05-02
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World Journal of Microbiology & Biotechnology
Abstract
This study was undertaken to characterize Streptomyces strains occurring in some soils of Tanzania as well as to
evaluate their potential to synthesize antimicrobial compounds. Six main classes of isolates were observed according
to the colour of aerial mycelium. These were gray, cream, blue, pink, red, and white. The gray colour class
dominated. About 65% of the isolates produced soluble pigments of various colours while about 33% of the isolates
did not produce any soluble pigments. Brown coloured soluble pigments dominated. About 57% of the isolates had
spiral spore chains. Some Streptomyces isolates displayed strong (>30 mm inhibition zone), moderate (20±30 mm),
or weak (<20 mm) antibiosis against the plant/animal pathogenic bacteria tested. Other isolates did not show any
antibiosis against any of the test pathogens. The plant pathogens CMM IPO 542 (Clavibacter michiganensis ssp.
michiganensis) and Xanthomonas vascatoria were inhibited by most of the Streptomyces isolates. Xanthomonas
oryzae pv. oryzae and X. campestris were inhibited by the least number of the Streptomyces isolates. Most of the
animal pathogens tested seemed to show resistance to the antibiotics produced by some of the Streptomyces isolates
which had shown high activity against the plant pathogens.
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Journal Article
Keywords
Animal pathogens, antibiotics, antimicrobial activity, characterization, plant pathogens, Streptomyces