Figure 3

MK test results for adaptive divergence on genes involved in sensing and adhesion. Genes were extracted from sequenced genomes of three strains of X. axonopodis (Xav85-10, Xac306, and XapCFBP4838) and three strains of X. campestris (XccATCC33913, Xcc8004, and XccB100). The ratios of replacement and synonymous changes within a species were compared with the ratios of replacement and synonymous changes fixed between the species. Pooled refers to MK test done using both species, X. axonopodis and X. campestris. Using X. oryzae pv. oryzicola BLS256 as an outgroup served to ascertain which species has been affected by positive selection. A sequential Bonferroni correction for multiple tests was applied. Black squares correspond to high p values (p < 0.0034) and indicate robust evidence of positive selection before and after correction. Grey triangles indicate signals of positive selection, which are not considered after sequential Bonferroni correction: dark-grey and light grey triangles indicate p values ranging from 0.0034 to 0.01 and from 0.01 to 0.05, respectively. White squares correspond to non-significant p values (p > 0.05) and indicate no signal of positive selection. A non-available result (n.a) means that the orthologous sequences were lacking on the genome sequence. Lack of polymorphism did not allow test computation (n.c).