Summary: Mucoid variants of isolated or could be classified into two phenotypic groups based on whether alginate was produced on a chemically defined medium. Mucoid strains yielded lower recombination frequencies than the non-mucoid parent when used as donors in FP2-mediated plate matings. The mucoid characteristic () was co-inherited by a proportion of recombinants selected for the inheritance of chromosomal markers or . The results of further experiments using either a mucoid recipient or a mucoid donor carrying plasmid R68.45 suggested that the control of alginate production in involves at least one chromosomal locus.


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