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How does pedigree breeding produce improved varieties of self-pollinated crops?
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Plant breeding
Triticale is a hybrid of rye and wheat.
Pedigree breeding is a systematic method used to develop improved varieties of self-pollinated crops by combining desirable genes from two or more parent plants. The process relies on maintaining a detailed record of parent-progeny relationships to track the genetic lineage of the plants.1
The procedure typically follows these steps:
- Hybridization: Breeders cross two genotypes, each possessing desirable traits the other lacks. If necessary, a third parent can be introduced by crossing it with the first-generation (F1) hybrid.1
- Selection: Starting in the F2 generation, breeders eliminate individuals with undesirable major genes. As natural self-pollination occurs in subsequent generations, the population becomes increasingly homozygous (pure-breeding).1
- Family Evaluation: By the F5 generation, selection shifts from individual plants to families. Breeders use the pedigree record to identify and retain superior families.1
- Performance Testing: Once the number of families is reduced (usually by the F7 or F8 generation), the remaining strains undergo precise evaluation for yield, quality, and performance across multiple years and locations before a new variety is released for commercial production.1
This method allows for the efficient management of the vast number of genotypes created through hybridization.1