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P1, P2, and Mu lysogens of Escherichia coli reproduce more rapidly than nonlysogens during aerobic growth in glucose-limited chemostats. Thus, prophage-containing stains of E. coli are reproductively more fit than the corresponding nonlysogens. If mixed populations are grown by serial dilution under conditions in which growth is not limited, both the lysogen and nonlysogen manifest identical growth rates. The increased fitness of the lysogens in glucose-limited chemostats correlates with a higher metabolic activity of the lysogen as compared with the nonlysogen during glucose exhaustion. We propose that P1, P2, Mu, and lambda prophage all confer an evolutionarily significant reproductive growth advantage to E. coli lysogenic strains.
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