Download e-book for kindle: Advances in Microbial Ecology by Richard E. Lenski (auth.), K. C. Marshall (eds.)

By Richard E. Lenski (auth.), K. C. Marshall (eds.)

ISBN-10: 1468454099

ISBN-13: 9781468454093

ISBN-10: 1468454110

ISBN-13: 9781468454116

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BApproximate densities were obtained from the figure that is indicated for each reference. These values are necessarily rough because of the often pronounced variation even between successive samples. The various studies differed somewhat in culture conditions. Most notably, Paynter and Bungay (\969) used broth at 30°C, whereas all others used minimal media at 37°C. 3 turnover/hr. R. Lenski 100 300 200 400 500 TlME(hr) Figure 3. Dynamics of the interaction between E. coli B and virulent phage T4 in chemostat culture.

This general result is again illustrated in Fig. 3. Note that although the bacteria evolved resistance and there were no corresponding host-range mutations, the phage persisted indefinitely. In fact, virulent phage may persist subsequent to the evolution of Interactions between Bacteria and Virulent Bacteriophage 29 resistant bacteria, without extending their host range, by continuing to exploit sensitive bacteria that themselves persist due to superiority in competition for resources. However, these basic chemostat experiments do not exclude the possibility that phage are actually capable of growing on the "final" resistant bacterial genotype, but with such meager infectiousness that plaques are not observed.

Hence, the possibilities of stable coexistence would seem more limited, as virulent phage may reach high densities for a sufficient length of time to encounter and destroy all sensitive bacteria, as shown in Fig. 2c. It is certainly the conventional wisdom that in preparing phage lysates, sensitive bacteria are driven extinct as the culture is cleared, even though the culture may eventually become turbid with resistant bacteria. R. E. Lenski, B. R. Levin, and R. V. Evans (unpublished data) have examined the dynamics of virulent phage and bacteria in two serial transfer habitats.

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Advances in Microbial Ecology by Richard E. Lenski (auth.), K. C. Marshall (eds.)

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