An element controlling chloramphenicol resistance () was detected in 3(2). Strains sensitive to I μg chloramphenicol ml were obtained among dark scarlet variants. Transfer of the resistance factor was attempted in matings between chloramphenicol-resistant (Chl) and chloramphenicol-sensitive (Chl) strains, both of which lacked the SCP fertility factor. Transfer of was obtained at a much higher rate than that expected for chromosomal markers in SCP x SCP matings. However, in these particular crosses the latter was also several times higher than usual. All recombinants for chromosomal markers were Chl. Attempts to locate the element failed to distinguish between a chromosomal and an extrachromosomal site. The observed increase in the recombination frequency for chromosomal markers suggests that the element may promote recombination.


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