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Selection under negative linkage disequilibrium. Random mating versus inbreeding.

L Silvela¹, I D de la Peña, R Gomez-Ruano

¹Instituto Nacional de Investigaciones Agrarias., Mejora Animal., c/ La Coruña Km. 7, Apdo. 8111, 28040 Madrid, Spain. silvela@inia.es

|June 26, 1999

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Random mating strategies (RIS) in plant breeding significantly outperform inbred strategies (IS) for developing elite lines. This random strategy maximizes genetic gains, especially in self-pollinating crops, by leveraging heterotic epistasis.

Area of Science:

Plant breeding
Quantitative genetics
Crop improvement

Background:

Diallel crosses are crucial for assessing combining ability in elite inbred lines.
Selection strategies significantly impact the genetic gains achieved in breeding programs.
Understanding mating systems is key to optimizing crop improvement.

Purpose of the Study:

To compare the effectiveness of two selection strategies: inbred strategy (IS) and random strategy (RIS).
To evaluate the impact of mating systems (brother-sister vs. random mating) on the development of inbred lines.
To investigate the genetic basis of observed performance differences, including epistasis and disequilibrium.

Main Methods:

A diallel cross population was developed from elite inbred lines.

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Two selection strategies were applied: IS (brother-sister mating) and RIS (random mating).

Final lines were completely inbred, and performance was compared between strategies.

Main Results:

Random strategy (RIS) populations showed significantly better response than inbred strategy (IS) populations.
The advantage of RIS was evident from the start and increased throughout the experiment.
One inbred line exhibited superior performance, indicating fixed heterotic epistatic combinations.

Conclusions:

Recurrent selection under random mating is more effective for self-pollinating crops.
Negative initial disequilibrium and epistatic gene action are important factors in breeding programs.
RIS offers a promising approach for maximizing genetic gains and fixing favorable epistatic interactions in homozygous lines.