TABLE 8

Digenic epistatic QTL affecting F1 hybrid performance and heterosis (HMP) of 1000 grain weight (GW, g) detected in the Lemont (LT)/Teqing (TQ) BCF1 (RILs × LT and TQ) and two testcross F1 (RILs × Z413 and IR64) populations

QTLi Marker intervalWTLj Marker intervalF1HMP
Pop.ChromosomeChromosomeLODaIajaaijR2 (%)LODaiajaaijR2 (%)
LT1C944b–RG9575RG13–CDSR493.10−0.86***6.6
LT2RZ476a–RZ5993RG348a–C636x3.90−1.06***9.2
LT2G45–RZ386a5RG13–CDSR493.581.29***13.8
LT4G177–RZ590b11G44–RG1094b2.55−0.67**4.0
LT5RG13–CDSR4912G1106–RG901a3.510.86***6.5
LT6RG653–Z5087RG29–G370b6.810.89**27.5
LT6HHU37–RZ6829G95–R662b2.960.86***6.5
LT6RZ516–RZ29RG451–RZ4044.321.11***10.2
LT7RG29–G370b8G187–G56a3.37−0.92***7.0
TQ1RG236–RZ8018C1073a–G1875.470.75**1.14***14.82.290.83**6.7
TQ2RG83–G13273C746–CDO3373.630.80***6.2
TQ2C624x–G458G187–G56a5.20−1.19***16.13.44−1.01***10.0
TQ5RG556–gl19RZ698–G952.41−0.64**5.12.58−0.90***7.9
TQ5R569a–RG138G104–G1314a2.09−0.77**5.96.42−1.39***18.8
TQ8C225c–G2132a12RG901a–G4023.200.97***9.1
Z4131RZ288–C13110RG561–C2232.73−0.58**5.31.76−0.46*4.5
Z4133C515–RG348a6RG424–G1314b6.42−0.46**0.93***11.1
Z4134RG214–Ph9RZ777–CDO822.85−0.54**5.7
Z4135RG556–gl16G294d–G294a2.050.50**4.9
Z4136G1314b–HHU377BCD855–CDO3854.990.91***10.63.590.81***12.9
Z4138G1314a–G214010RG561–C2237.09−1.02***13.6
Z4138RZ323a–C225c12G1106–RG901a5.500.85***9.3
IR641RG957–RG4621RZ288–C1314.92−0.69***8.45.400.30*−0.72***10.0
IR641CDO348–CDO226a12RG20q–RG91q2.820.51***4.7
IR642G1327–RG63411RZ900–G442.600.57**5.63.630.61***7.1
IR643RG482–CDO795a6G1314b–HHU374.94−0.30*0.64***7.1
IR644RG1094e–Y1065Lc8C225c–G2132a3.370.60***6.32.590.66***8.3
IR644RG1094e–Y1065Lc9CDO395–CDO10814.06−0 77***10.4
IR646G1314b–HHU379RG570a–RG4512.940.66***8.2
  • 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.