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Rice Genetics IV - IRRI books - International Rice Research Institute

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Table 3. QTLs detected for yield and yield component traits in the analysis of the “immortalized”F 2population for the field trial of 1998.Trait QTL Flanking markers LOD Var (%) A DYield (g) yd6 R2147-C751a 4.76 13.9 3.37 –2.75yd7 R1440-G678 2.60 3.6 –1.96 0.21yd9a G570-G667 3.20 4.5 –1.23 3.45yd9b RM201-RM215 3.05 12.5 –1.21 5.25yd11 R543a-RZ536 2.46 3.5 0.07 2.72Tillers plant –1 tp1 G236-C112 3.40 6.3 –0.80 –0.45tp3 C316-C63 3.73 5.2 0.79 0.27tp5a C734b-RZ649 3.31 5.6 –0.86 –0.20tp5b RM26-C1447 5.13 7.1 1.08 0.20tp6a RZ398-R1014 3.00 4.3 0.78 –0.78tp6b P-G200 3.81 5.3 –0.29 –1.01Grains panicle –1 gp1 RM237-C922 3.08 5.5 0.99 8.22gp3 RZ403-C1087 3.96 6.3 6.38 0.45gp6 R2147-C751a 4.51 8.8 7.42 –3.73gp7 C1023-R1440 4.53 6.6 –6.38 2.22gp12 R887-G1314b 3.19 4.5 4.79 5.46Grain weight (g) kgw1a G359-G532 4.52 7.1 0.75 0.24gw1b C86-G236 2.68 4.5 0.59 0.07kgw3a G393-G144 10.04 13.4 –1.01 –0.33kgw3b RZ403-C1087 17.88 26.0 –1.40 –0.76kgw5 G360-C734b 8.33 13.0 1.03 –0.08kgw7 G528-G128 4.71 6.9 –0.73 0.24kgw7 G678-RZ471 2.79 4.4 –0.58 –0.41kgw8 R1394-R727 2.99 4.8 0.41 –0.61kgw9 RM242-G570 3.22 4.8 0.70 –0.05kgw10 C1633-C677 3.31 5.3 0.55 0.53kgw11 G44-G257 2.42 3.7 –0.65 0.36kgw12 G1128a-R887 3.57 5.0 0.64 0.45Table 4. Significant interactions identified for performance of yield and yieldcomponent traits by searching all possible (23,239 in total) two-locus combinations.Trait Pairs a AA b AD (DA) b DD bYield 134 116 70 16Tillers plant –1 96 86 50 7Grains panicle –1 100 79 51 14Grain weight 224 185 78 16aSignificant at the 0.001 probability level. b Significant at the 0.01 probability level.traits and genes in the manifestation of heterosis is much more complex than hascommonly been expected on the basis of dominance and overdominance hypotheses.Gene expression and heterosisWe have also been interested in the last several years in the relations between geneexpression and heterosis, with the belief that the manifestation of heterosis is thedirect outcome of gene expression.180 Qifa Zhang et al

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