PMID:9177998
| Citation |
Travisano, M (1997) Long-term experimental evolution in Escherichia coli. VI. Environmental constraints on adaptation and divergence. Genetics 146:471-9 |
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| Abstract |
The effect of environment on adaptation and divergence was examined in two sets of populations of Escherichia coli selected for 1000 generations in either maltose-or glucose-limited media. Twelve replicate populations selected in maltose-limited medium improved in fitness in the selected environment, by an average of 22.5%. Statistically significant among-population genetic variation for fitness was observed during the course of the propagation, but this variation was small relative to the fitness improvement. Mean fitness in a novel nutrient environment, glucose-limited medium, improved to the same extent as in the selected environment, with no statistically significant among-population genetic variation. In contrast, 12 replicate populations previously selected for 1000 generations in glucose-limited medium showed no improvement, as a group, in fitness in maltose-limited medium and substantial genetic variation. This asymmetric pattern of correlated responses suggests that small changes in the environment can have profound effects on adaptation and divergence. |
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| Keywords |
Adaptation, Physiological/genetics; Analysis of Variance; Arabinose/metabolism; Biological Evolution; Culture Media; Escherichia coli/genetics; Escherichia coli/physiology; Genetic Markers; Genetic Variation; Glucose/metabolism; Maltose/metabolism; Selection, Genetic; Time Factors |
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