Journal Club 16 February: The long-term maintenance of a resistance polymorphism through diffuse interactions
A very interesting paper about the (lack of) coevolution between Arabidopsis thaliana and its pathogen, Pseudomonas syringae. Karasov et al. (2014) analysed the polymorphism in the host and the pathogen at genes highly involved in resistance and pathogenicity, respectively. The main conclusion is that the seemingly stable polymorphism at the resistance gene in the host may not in the end be maintained by coevolutionary balancing selection processes but rather by diffuse community-wide interactions.