Table 1 Epistatic interaction observed between genotypes at RM6081 and RM471 fitted to a gametophytic BDM incompatibility model in BC4F3 populations derived from a cross between T65 (O. sativa) and IRGC105715 (O. nivara)
GenotypeExpected RatioaNumber of Individualsχ2b
RM471 (DGS1)RM6081 (DGS2)ExpectedObserved
T/TcT/T1/127.590.3
T/N2/1215140.07
N/N1/127.590.3
T/NT/T1/127.5101.7
T/N3/1222.5180.9
N/N2/1215157.5
N/NT/T0/1200
T/N1/127.570.03
N/N1/127.580.03
Total190902.46
P0.92
  • a Expected ratio based on the hypothesis that DGS1 and DGS2 segregate independently, and that pollen of genotype N|T is sterile. See Figure S2 in File S1 for further explanation.

  • b Each value in the column contains rounding error.

  • c T/T, homozygous for T65 allele; T/N, heterozygous; and N/N, homozygous for O. nivara allele at the indicated marker locus.