The zone of inhibition of the wild-type R1 (black bar), Mt-0865 (gray bar) and C-0865 strains (white bar) respectively, under various cations stress.

<p>Strains were cultured in TGY plates, overlaid with filter discs saturated with 1 M solution of various cations. The zone of inhibition was measured from the edge of the disc after 3 days. Data represent the means ± standard deviation of three independent experiments.