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Table 2 Survival rate (S rate) of a Z-mating mixture between isogenic strains IL1 and IL4 and between their spontaneous-zygogenesis-promoting (Szp+) derivatives MG405 and MG406 differing by their resistance to lethal drugs, either kanamycin (K) or gentamicin (G), when exposed to both

From: Selection and evolution of mating products after spontaneous zygogenesis in Escherichia coli K-12

Seta

Total CFU mL-1 (Nt)b

S-rate Nt/Noc

Ratio of S-rates M+ vs. M-

1. M1−

1.3 ± 0.5 × 108

3.1 × 101

 

2. M1+

1.0 ± 0.4 × 105

2.4 × 10−2

7.7 × 10−4

3. M2−

1.4 ± 0.8 × 108

2.8 × 101

 

4. M2+

4.7 ± 4.0 × 106

9.2 × 10−1

3.3 × 10−2

  1. aA non-mating mixture of IL1 and IL4 (M1) and a Z-mating mixture of MG405 and MG406 (M2) were incubated in LB for 3 h with (M+) or without (M-) added KG (KG) before centrifugation and plating of samples (diluted or not) on NA
  2. bAverage of the different frequencies
  3. cCFU mL−1 of the minority parent was 4.2 × 106 in M1 (IL1) and 5.1 × 106 in M2 (MG405)
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Annals of Microbiology

ISSN: 1869-2044

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