Abstract
Genetically labelled strains of Bacillus subtilis have been shown to exchange blocks of linked genes while growing together in soil. After eight days of incubation, 79% of unselected colony-forming units exhibited a phenotype containing markers from both parents; the parental strains were not detected after the first day of incubation. High frequencies of transformation were also obtained by adding genetically labelled deoxyribonucleic acid to single-strain soil cultures. Observed linkage of genetic markers was greater in soil transformation than in standard laboratory procedures. The results indicate that transformation may play an important role in the adaptation of the Bacilli to their natural habitat.
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