Dominance Relationships in Mixedly Infected Bacillus subtilis

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RESUMO

The progeny released from Bacillus subtilis cells mixedly infected with bacteriophages β22, SP82, and SP02c1 have been studied at varying multiplicities of infection and orders of addition and with different host strains of the bacterium. In B. subtilis 168, SP02c1 was subordinate to both SP82 and β22 and did not yield significant numbers of progeny even when added 5 min before the superior phage. Dominance in mixed infections of β22 and SP82 was host-dependent. In B. subtilis 168, SP82 was dominant and greatly reduced the yield of β22 if added simultaneously or before the subordinate partner. However, in the same mixed infection in B. subtilis SB11, β22 was the dominant phage and totally suppressed the production of SP82 even when added 5 min after the latter.

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