Molecular and General Genetics MGG

, Volume 143, Issue 2, pp 223–232

Isolation of Rec mutants from an F-prime merodiploid strain of Escherichia coli K-12

  • K. A. Stacey
  • Robert G. Lloyd

DOI: 10.1007/BF00266925

Cite this article as:
Stacey, K.A. & Lloyd, R.G. Molec. Gen. Genet. (1976) 143: 223. doi:10.1007/BF00266925


This paper describes a method of screening mutagenised populations of an E. coli galAgalBF-prime merodiploid for mutants defective in recombination. The method relies on scoring colonies on Eosin-Methylene Blue agar that have fewer than normal numbers of Gal+ papillae. With a suitable choice of galmutations most of the papillae arise by recombination and some of those colonies with less than normal numbers prove to be defective in some aspect of recombination or DNA repair. In addition to strains carrying mutations that can be ascribed to known loci, several novel mutant phenotypes were identified.

Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • K. A. Stacey
    • 1
  • Robert G. Lloyd
    • 1
  1. 1.School of Biological SciencesUniversity of SussexBrightonEngland
  2. 2.Biological LaboratoryThe UniversityCanterbury
  3. 3.Genetics DepartmentUniversity of NottinghamNottingham

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