FIG. 1.
Phylogeny of Photorhabdus strains (Table 1) highlighting the two groups showing orally toxic culture supernatants. Note that oral toxicity is found in two well-supported subspecies, P. luminescens subsp. akhurstii and P. luminescens subsp luminescens (termed groups 1 and 2). The tree was constructed by using Kimura's two-parameter model of distance estimation and running 1,000 bootstrap replicates with the MEGA program (Molecular Evolutionary Genetics Analysis, version 2.1; Arizona State University).