Extended Data Fig. 7: The relationships between heterozygosity levels and heterosis and between accumulated superior heterozygous alleles and heterosis for yield-related traits in four testcross populations.
From: Genomic insights into historical improvement of heterotic groups during modern hybrid maize breeding
a-d, Each plot group includes six plots for two traits (kernel weight per ear (KWPE) and ear weight (EW)): Left plot, correlation between heterozygosity levels of whole-genome nonsynonymous SNPs in non-divergent regions and better parent heterosis (BPH) of KWPE and EW in the testcross population. Middle plot, correlation between heterozygosity levels of nonsynonymous SNPs located in genes continuously selected in divergent regions and BPH of KWPE and EW in the testcross population. A total of 2,563 and 2,136 nonsynonymous SNPs contained in 478 and 375 genes continuously selected in PA × SPT and US_SS × US_NSS, were used to calculate the heterozygosity levels for the testcross populations from PA × SPT and SS × NSS heterotic patterns, respectively. Right plot, correlation between the number of accumulated superior heterozygous alleles and BPH of KWPE and EW in the testcross population. Four testcross populations include 88 hybrids derived from CNH3754 (a PA inbred) × 88 SPT inbreds, 91 hybrids derived from 91 PA inbreds × Jing2416 (a SPT inbred), 106 hybrids derived from Xunshi104-8 (a SS inbred) × 106 US_NSS inbreds, and 101 hybrids derived from 101 US_SS inbreds × F62 (a NSS inbred). The Pearson correlation coefficient (r) and P value are presented.
