Novel genomic approaches unravel genetic architecture of complex traits in apple

BMC Genomics

Table 2 Estimates of variance explained by single nucleotide polymorphisms (SNPs) for various apple fruit traits; FF: fruit firmness; WCI: weighted cortical intensity; IB: internal browning; TA: titratable acidity; CR: fruit splitting; BP: bitter pit

Trait	$h_{A}^{2}$ ¹	GWAS²	$h_{G}^{2}$ ³
FF	0.39	0.03	0.43
WCI	0.26	0.25	0.50
IB	0.49	0.11	0.16
TA	0.15	0.07	0.31
CR	0.30	0.11	0.23
BP	0.22	0.12	0.25

¹Estimates of narrow-sense heritability (h²) obtained using pedigree-based relationships matrix (A). Approximate standard errors of $h_{A}^{2}$ estimates varied from 0.12 (for TA) to 0.30 (for IB).
²Proportion of the phenotypic variance explained jointly by genome-wide significant SNPs.
³Simultaneously using all 2,500 markers in the form of the G matrix. Approximate standard errors of $h_{G}^{2}$ estimates varied from 0.02 (for IB) to 0.04 (for WCI).

ISSN: 1471-2164