Fig. 3

Phylogenetic trees of Xenorhabdus bacteria and main steinernematid clades and their associations. Phylogenetic relationships among Xenorhabdus were reconstructed based on core genome sequences of Xenorhabdus type strains. 1,466,520 nucleotide positions (1439 core genes) were used in the analyses. Bar represents 0.05 nucleotide substitutions per sequence position. NCBI accession numbers of the genome sequences used for the reconstruction are shown in Table S1. Phylogenetic relationships within Steinernema clades are based on Spirodonov and Subbotin [51]. The associations between nematodes and bacteria are depicted by lines, and different line colors distinguish the associations of nematodes from distinct clades