Summary
Four strains ofRhizobium trifolii were individually inoculated to pots containing sterilized sand vermiculite mixture, half of which were seeded with red clover and half not. Pots were maintained in an ordinary glasshouse and watered with tap water.
Phage was first detected after 4 months, and almost all pots contained one or more phages againstRhizobium trifolii after 9 months. The presence of plants increased the titer of phages in some pots inoculated withR. trifolii, but had no effect on the number of different phages.
The pots also contained phages against soil bacteria other than Rhizobium indicating that phages are spread readily and constitute a normal part of the life cycle of soil bacteria.
The number of different phages isolated from the pots was affected by the strain of Rhizobium used as inoculum.
References
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Kleczkowska, J. Establishment of phage and bacteria in a sterilized compost in a glasshouse. Plant Soil 37, 425–429 (1972). https://doi.org/10.1007/BF02139986
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DOI: https://doi.org/10.1007/BF02139986