Abstract

Lysogenic infections were demonstrated in microcosms of sterile soil inoculated with Streptomyces lividans and the φC31 derivative, KC301, in free state or via lysogenized hosts. Intermittent soil mixing caused liberation of KC301 due to lysis of germinating lysogenized and uninfected spores. The presence of lysogenized host ensured that KC301 was maintained at a constant density. The lysogen S. lividans TK24 (KC301) achieved a population density lower than that of its non-lysogenized counterpart. Thiostrepton in the soil did not select for the thiostrepton resistance gene KC301. The long-term survival in soil of a temperate actinophage was demonstrated.

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