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Heterogenomic recombinants from compatible nocardiae.

G H Brownell, R S Walsh

    Journal of Bacteriology
    |October 1, 1970
    PubMed
    Summary
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    Genetic stability in Nocardia recombinants was assessed. Some recombinants were stable haploids, while others were heterozygous diploids, indicating genetic reassortment potential in Nocardia species.

    Area of Science:

    • Microbiology
    • Genetics

    Background:

    • Nocardia species are important in various environments.
    • Understanding genetic stability in Nocardia recombinants is crucial for their application.

    Purpose of the Study:

    • To evaluate the genetic stability of recombinants from Nocardia erythropolis x N. canicruria matings.
    • To investigate the genetic behavior of these recombinants under unselected growth conditions.

    Main Methods:

    • Comparing phenotypes of Nocardia recombinants under direct selection versus unselected growth.
    • Utilizing contraselective loci to analyze mapped genetic characters.
    • Assessing segregation patterns and phenotypic variation.

    Main Results:

    • Recombinant populations exhibited varied genetic stability, with some appearing as stable haploids and others as heterozygous diploids.

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  • Segregation of new phenotypes from heterozygous diploids was observed.
  • All regions of the parental genomes were involved in segregation, suggesting merozygotic behavior.

    • Conclusions:

    • Nocardia recombinants can form diploids that segregate parental or recombinant genomes.
    • These diploids can persist and undergo further genetic reassortment.
    • Differences in nuclear division times between parental strains likely influence segregant characteristics.