Fig. 4.

Correlations (r) between mid-parent heterosis (MPH) and best-parent heterosis (BPH) for fruit yield, count, weight, firmness, TSS, TA, TSS/TA, and ANC among strawberry hybrids ($n=469$) grown in Salinas, California field experiments in 2017–2018 and 2018–2019. H was estimated from a genome-wide sample of 28,513 SNPs genotyped with a 50K Axiom array. MPH ratios were estimated by $({\overline{y}}_{F1}-{\overline{y}}_{MP})/{\overline{y}}_{MP}$, where ${\overline{y}}_{MP}=({\overline{y}}_{P1}+{\overline{y}}_{P2})/2$, ${\overline{y}}_{P1}$ is the EMM for one parent, ${\overline{y}}_{P2}$ is the EMM for the other parent, and ${\overline{y}}_{F1}$ is the EMM for the hybrid. BPH ratios were estimated by $({\overline{y}}_{F1}-{\overline{y}}_{BP})/{\overline{y}}_{BP}$, where ${\overline{y}}_{BP}$ is the EMM for the best-parent. The best parent for an $\text{elite}\times \text{elite}$ hybrid (blue circles) was the parent with the largest EMM, whereas the best parent for an elite × exotic hybrid (red circles) was the elite parent. The shades of blue identify hybrids ($n=356$) within different $\text{elite}\times \text{elite}$ full-sib families, whereas the shades of red identify hybrids ($n=113$) within different elite × exotic full-sib families. The solid blank lines are predicted values from linear regressions of BPH ratio on MPH ratio.