Soil bacteriostasis: Relation to bacterial nutrition and active soil inhibition |
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| Authors: | RD Davis |
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| Institution: | University of London Kings College, Department of Plant Science, 68 Half Moon Lane, London SE24 9JF U.K. |
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| Abstract: | Soil can inhibit or reduce the growth of bacteria in agar discs incubated in contact with it and this bacteriostatic property is broadly similar to fungistasis. It was only operative at low nutrient concentrations and could be removed by adding nutrients to soil or by keeping the discs containing bacteria continually supplied with nutrients during their incubation on soil. The effect was also removed when discs were dosed with nutrients after incubation on soil, and then reincubated away from soil. The bacteriostatic factor is apparently unstable away from soil as it could not be demonstrated in agar discs previously incubated on soil, which were expected to contain inhibitor at operative concentrations. Attempts to demonstrate inhibitory activity in soil extracts, and preliminary experiments to detect volatile inhibitors emanating from soil were also unsuccessful. |
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