1887

Abstract

Mating procedures for detection of mobilization of the chromosome were re-investigated. The chromosome was mobilized by plasmid D, the previously used hybrid between plasmids P- and Rll9. About a 40-fold increase in recombinant recovery correlated with the absence of swarming during mating and a lower temperature of incubation. The modification introduced was that conjugation was allowed to proceed on a non-selective supplemented minimal medium at 30 °C before washing and plating on selective media. Final incubation was also at 30 °C. This technique enabled eight additional chromosomal markers to be mapped. Polarized transfer of the chromosome was shown by gradient of transmission experiments using a previously described marker as reference, by linkage analysis with reference to proximal and distal markers and (less successfully) by interrupted mating on solid medium. Markers of plasmid D transferred at high frequency to all recombinants. The plasmid was stable in recombinants and could transfer itself and chromosomal markers of the new hosts in further matings. Resulting recombination of markers occurred at usual frequencies. The marker order, , , , , , , , , , , , , , , , , did not resemble the order of these markers in .

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1978-07-01
2022-01-23
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