Figure 2.

Symbionts that vary in benefit to the host experience absolute and conditional partner choice. DGEs, main SGEs and genotype-by-genotype (G × G SGEs) impact Mesorhizobium and Acmispon wrangelianus fitness. Shown is the per cent of the phenotypic variance in (a) nodule number, (b) nodule proportion and (c) shoot mass, with complementary heat maps, respectively (d–f). Heat maps show the (d,e) focal strains fitness against each competitor or (f) host fitness in each one-strain combination. Heat map diagonal in (d) is the one-strain inocula nodule number halved to compare with two-strain inocula nodule number, in (e) no biological data, and in (f) is the host shoot mass in one-strain inocula.