Agronomy & Horticulture Exten Assoc Professor
Breeding for Grain Quality Traits: The challenges of measuring phenotypes and identifying genotypes.
Recessive you know, dominant you don’t
Do plant breeders prefer to work with dominant
While dominant traits are more commonly generated in families that have the trait
, the breeder will actually have less work in establishing a true breeding line
that expresses a recessive trait. Red vs. white wheat is a good example. Once a white seeded F2 is identified we know it will be true breeding because it is homozyous recessive at the gene
pairs that control this trait (fig. 7). Red F2s are more common but a breeder does not know if a red type they select will produce white offspring because they carry the recessive allele
for white. A breeder must grow out progeny
from the reds, make sure they are all red and harvest this family separately to insure they have identified a true breeding red. Both dominant and recessive traits can be established in true breeding lines
but the selection
for true breeding parents is easiest with recessive traits.
Please confirm your selection.