TABLE 7

Digenic epistatic QTL affecting F1 hybrid performance and heterosis (HMP) of grains/plant (GP) detected in the Lemont (LT)/Teqing (TQ) BCF1 (RILs × LT and TQ) and two testcross F1 (RILs × Z413 and IR64) populations

QTLi Marker intervalQTLj Marker intervalF1HMP
Pop.ChromosomeChromosomeLODaIajaaijR2 (%)LODaiajaaijR2 (%)
LT1C112–RG23611RZ53–RZ7813.35−0.99***12.34.61−1.31***17.5
LT1R210–RZ3822RG83–G13272.900.80***8.1
LT3RG450–RG1008G187–G56a2.641.03***13.32.361.14**13.2
LT5RG556–gl18C424b–RZ1434.19−0.73**−1.00***10.2
LT6RZ762–C768G187–G56a2.210.68**5.94.381.27***16.5
LT9RZ777–CDO8210C16–RG5613.89−0.50*−1.07***14.53.42−0.72**−0.81**6.6
TQ1RG462–CDO1186G200a–RZ6673.570.50***7.03.880.53***6.0
TQ1CDO455–RZ776a1RG472–RG4472.670.42**4.9
TQ4HHU39a–RG14311RG16–RZ797b3.990.27*0.58***9.32.950.27*0.46**4.5
TQ4G177–RZ590b6RG424–G1314b5.28−0.63***10.94.070.45**−0.64***9.0
TQ4RG214–Ph11RZ781–C9753.14−0.54***8.14.44−0.70***10.8
TQ3C746–CDO3376G1314b–HHU372.110.47**4.7
TQ5RG556–gl111RG1109–RZ537b2.16−0.47**4.8
Z4131RZ14–C944b6G1468b–RG4242.100.35**5.42.270.38**5.1
Z4131CDO118–CDO4555Y1049–R569a2.68−0.50***8.44.31−0.67***12.2
Z4131C131–RG4724RG1094e–Y1065Lc4.030.55***10.13.50.52***7.7
Z4132RG139–C624x8C825a–CSU7543.40.40**−0.44***6.43.050.43**−0.42**7.5
Z4134Ph–G3798G187–G56a2.380.34**−0.365.32.65−0.39**5.4
IR643G249–RG41811RG1109–RZ537b2.16−0.29**6.44.810.26**−0.20*−0.35**6.4
IR644G177–RZ590b11RG16–RZ797b4.15−0.19*0.33***8.05.22−0.26**0.36***6.6
IR648C825a–CSU75411RZ797b–RG1094d2.28−0.27**0.20*4.43.41−0.32**0.32**5.2
  • ai and aj are the main effects of the loci i and j, estimated by the difference between heterozygote, the homozygote in the BCF1 populations (LT and TQ), and by the differences between the two heterozygotes (tester/Teqing − tester/Lemont) in the testcross populations (Z413 and IR64) using the F1 mean and HMP measurements; aaij is the epistatic effect between loci i and j, as defined by Mather and Jinks (1982). * Significance levels of P < 0.05. ** Significance levels of P < 0.001. *** Significance levels of P < 0.0001.