Fig. 1.—
Relationships between substitution rates (A: dN and B: dS) of Burkholderia orthologs and gene expression measured in strain HI2424. Both values were cube root transformed. The overall regressions are significant (dN vs. expression: F = 384, dfs = 1, 4,079, P < 10−16, r2 = 0.086; dS vs. expression F = 553, dfs = 1, 4,079, P < 10−16, r2 = 0.120), and all pairwise comparisons among chromosomes (boxplots) differ significantly (expression: chromosome 1 (c1) to chromosome 2 (c2), t = −14.2, df = 2,885, P < 2.2 × 10−16; c2 to c3, t = −6.44, df = 261, P = 5.75 × 10−10; dN: c1 to c2, t = 11.12, df = 3,556, P < 2.2 × 10−16; c2 to c3, t = 3.51, df = 301, P = 0.000516; dS: c1 to c2, t = −13.72, df = 3,235, P < 2.2 × 10−16; c2 to c3, t = −6.56, df = 276, P = 2.711 × 10−10).