FIG. 2.

Effect of sulA expression on the formation of FtsZ rings. The strain carrying two compatible plasmids pSS10c (with an ftsZ-gfp fusion) and pSS14 (with the sulA gene) were grown in BG11 without (A and B) or with (C and D) 0.2 μM CuCl₂. The same filaments were pictured under bright light (A and C) or under epifluorescence excited by light of 465 nm (B and D). (E and F) Controls representing the wild-type strain grown in BG11 with 0.2 μM CuCl₂, pictured under the microscope under the same conditions. The background fluorescence is due to the presence of photosynthetic pigments. Scale bars, 5 μm.