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Fig. 2. Three measures of heterosis in the progeny of diverse alfalfa germplasm crossed to elite genotypes based on data across 2 yr and two locations in Iowa, USA versus the total yearly biomass yield of the average performance of the parents involved in each cross. In all three graphs, the vertical line represents the average biomass yield of the elite tester populations. (i) High-parent heterosis (R2 = 0.37). The horizontal line represents zero heterosis. (ii) Midparent heterosis (R2 = 0.57). The horizontal line represents zero heterosis. (iii) Halfsib testcross progeny yield (R2 = 0.20). The diagonal line represents 1:1 ratio between axes.
