Figure 1.

Genotypic relationship between the proportion of non-fixing nodules (ineffective nodules) and (a) shoot biomass and (b) mortality in the mutualist (dashed line, open circles) and mixed treatment (solid line, closed circles). Each dot is a line mean (n = 110 plant lines/treatment). Grey error bars are ±1 standard error and the 95% CI of the fitted line is shaded in grey. The proportion of non-fixing nodules gives an estimate of exploiter strain occupancy in the mixed rhizobia treatment, which contains both mixed and mutualist rhizobia strains in the soil.