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Ultraviolet Radiation Sensitivity of White Mutants and Red Wild-Type Serratia marcescens
A. R. Hanks and E. Mroz
Vol. 48, No. 2 (Nov., 1971), pp. 312-318
Published by: Radiation Research Society
Stable URL: http://www.jstor.org/stable/3573315
Page Count: 7
You can always find the topics here!Topics: Serratia marcescens, Pigmentation, Ultraviolet radiation, Radiation tolerance, Pigments, Killing, Steepest descent method, Shoulder, Serratia, Gamma rays
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White mutants of Serratia marcescens, which do not produce the nonessential pigment prodigiosin, were found to be more resistant to killing by ultraviolet light (UV) than the red-wild type. Pigment induction in a white mutant, which sensitizes to gamma rays, does not change this mutant's UV resistance. Therefore, prodigiosin does not appear to sensitize to UV killing in these strains. Possible differences in UV sensitivity due to UV-induced lysis and filament formation were checked, but not observed. Post-UV plating of red and white Serratia on caffeine and acriflavin was found to decrease the survival for both strains, reflecting the probable existence of repair.
Radiation Research © 1971 Radiation Research Society