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slrA mutation is epistatic to pnpA mutation for cell chaining. (A) Phase-contrast microscopy of cell chaining for the indicated strains. pnpA+, wild-type 3610 strain; slrA+, additional copy of slrA gene; ΔpnpA, deletion of gene encoding PNPase; ΔslrA, deletion of gene encoding SlrA; ΔpnpA ΔslrA, deletion of genes encoding PNPase and SlrA. (B) Overnight growth of strains in the presence of increasing concentrations of tetracycline.
