Genetic Implications in Transferring Fertility Restorer Genes to a New Genetic Background in Sunflower (Helianthus Annuus L.)

The second generation progeny consisting of seven surviving plants of the cross between the male sterile hybrid, 2 cm 183 × E.C. 68415 and the restorer line, BCZ. 111 presented two types of segregation for the pollen fertile and sterile plants. Four of them gave a 3:1 ratio for the fertile and sterile fractions while the remaining three progenies fitted into a 9: 7 ratio, thus suggesting two genotypes in the F1 plants from the point of fertility restoration. The implications underlying this type of inheritance have been discussed and the genetic symbols of rf₁rf₁rf₂rf₂, Rf₁Rf₁rf₂rf₂ or rf₁rf₁Rf₂Rf₂ and Rf₁Rf₁Rf₂Rf₃ have been suggested for the parents 2 cm 183, E.C. 68415 and BCZ. 111 respectively.