TABLE 6

Number and type of epistatic interactions identified in the doubled-haploid (DH) and testcross (TC) populations and the midparent heterosis (MPH) data set

Type of epistasiscRange of the effects
TraitaData setNo. of locibIIIIIIepQTLdMinMaxVp(e)eVp(m)Vp(t)
GYDH160279−0.1080.11615.825.741.5
GYMPH170189−0.0810.05839.518.357.8
GYTC110066−0.0490.05935.50.035.5
TKWDH110347−0.0600.08719.028.547.5
TKWMPH100055−0.0300.03525.617.443.0
TKWTC170279−0.0300.02936.521.758.2
S/SilDH150189−0.5502.02930.218.648.8
S/SilMPH19001010−0.7300.59449.15.254.3
S/SilTC140088−0.5200.49836.211.848.0
Sil/dm2DH2312912−1.4201.68231.248.079.2
Sil/dm2MPH180099−1.4401.17139.00.0039.0
Sil/dm2TC21001212−1.1200.95445.68.854.4
  • a GY, TKW, S/Sil, Sil/dm2: Grain yield (tons per hectare), thousand-kernel weight (grams), seeds per silique, and siliques per square decimeter, respectively.

  • b Number of loci involved in digenic epistatic interactions.

  • c Epistatic interaction between (I) two loci with main effects, (II) a locus with main effect and a locus without significant main effect, and (III) two loci without significant main effects.

  • d Total number of epistatic interactions.

  • e Vp(e), Vp(m), Vp(t): percentage of phenotypic variance explained by epistasis, main-effect QTL, and the sum of both, respectively.