Genomic and phenotypic signatures of bacteriophage coevolution with the phytopathogen Pseudomonas syringae.

The rate and trajectory of evolution in an obligate parasite is critically dependent on those of its host(s). Adaptation to a genetically homogeneous host population should theoretically result in specialization, while adaptation to an evolving host population (i.e.

Digest: Investigating reproductive isolation in test tubes.

Reproductive isolation can result from incompatibilities between mutations that arise in different individuals. Wang and Cooper examined this mechanism of postzygotic isolation in Escherichia coli experimentally evolved in either glucose or lactose. They formed recombinants from parents evolved in the same or different environments.