Table 1.

Sources of variance in mixed models of plant trait values

Random effects	Shoot mass	Nodule number	Percent nitrogen in leaf
Symbiont genotype	31%	50%	64%
Host genotype	7%	10%	6%
Residual	62%	40%	30%

Traits were expressed in the greenhouse by factorial combinations of three Acmispon wrangelianus lineages and 37 Mesorhizobium strains. Presented are variance components for random effects and residual variance not accounted for by predictors as percentages of total phenotypic variance, after accounting for the fixed effect of soil type, reserve, and block.