1887

Abstract

SUMMARY

2004-6, a recipient strain, and 042, an Hfr donor strain of 04:K(undetermined): H5, were used in mating experiments with 12. 042 behaved like the 12 donor strain in mating experiments. These donor strains genetically recombined with the 12 recipient at higher frequencies than with 2004–6. The results of interrupted mating experiments were also more typical with the 12 recipient than with 2004–6 in that there were sharp entry times for the markers studied and linear increases of recombinants with time. The possibility that host-controlled restriction decreased genetic recombination between 12 and 2004–6 was pursued. We obtained no evidence for this possibility. Instead the data suggest that genetic heterology between these strains is affecting recombination. Genetic heterology also explains why 042 behaves more like a 12 donor in mating experiments with 2004–6.

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/content/journal/micro/10.1099/00221287-57-1-115
1969-07-01
2022-01-17
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