Fig. 4

pAt conjugation efficiencies of strain P4 and related mutants. Crosses involved the pAt donor indicated on the x axis and strain C58.00 as a recipient. Conjugation frequencies (y axis) were expressed per recipient cells. A Kruskal-Wallis non parametric test and a post-hoc Tukey test were used to evaluate whether the observed differences were significant (p ≤ 0.05) or not (p > 0.05). Results are shown by the letters displayed above the graph