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Theoretical modifications of reciprocal recurrent selection

J Moreno-Gonzalez, M Grossman

    Genetics
    |September 1, 1976
    PubMed
    Summary

    Reciprocal recurrent selection (RRS) and its alternatives (RRS-I, RRS-II) improve crossbred means. RRS-II is best when overdominance is minor, while RRS or RRS-I are superior if overdominance is significant.

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    Area of Science:

    • Quantitative genetics
    • Plant breeding

    Background:

    • Reciprocal recurrent selection (RRS) is a method to improve crossbred performance by utilizing overdominant loci.
    • RRS involves selfing and crossing individuals from two populations (A and B) with reciprocal testers.

    Purpose of the Study:

    • To propose and compare two alternative methods, RRS-I and RRS-II, to standard RRS.
    • To evaluate the effectiveness of RRS, RRS-I, and RRS-II under varying degrees of dominance and gene frequencies.

    Main Methods:

    • RRS-I uses a low-yield derived population from B as a tester for A.
    • RRS-II additionally uses a low-yield derived population from A as a tester for B.
    • Expected crossbred means were compared across selection cycles for different dominance scenarios.

    Main Results:

    • The optimal selection method depends on the relative importance of overdominant loci versus loci with incomplete or complete dominance.
    • RRS-II is most effective when overdominance is unimportant.
    • RRS and RRS-I outperform RRS-II when overdominance is important, with RRS preferred if overdominant effects are substantial.

    Conclusions:

    • The choice between RRS, RRS-I, and RRS-II should be guided by the genetic architecture of the trait, specifically the role of overdominance.
    • A combination of selection systems may be beneficial for complex genetic models with mixed dominance levels.

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