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Theoretical Comparison of Recurrent Selection Methods for the Improvement of Self-Pollinated Crops

Station de Génétique Végétale, Ferme du Moulon, 91190 Gif sur Yvette, France

P. Brabant and A. Gallais

INA-PG, 16 rue Claude Bernard, 75032 Paris Cedex, France, and Station de Génétique Végétale, Ferme du Moulon, 91190 Gif sur Yvette,, France

^* Corresponding author (isa{at}moulon.inra.fr).

Choosing a recurrent selection strategy depends on the resources of the breeder and on the efficiency of the possible selection schemes. An experimental comparison is difficult and time consuming, but a theoretical comparison may provide some guidelines. This study was conducted to compare theoretically the efficiency of different recurrent selection methods of improving the line value of a population, in this case, of self-pollinated crops. We considered five methods that are well adapted to breeding autogamous species: single-doubled-haploid descent selection with a 4-yr (SDH1) or 5-yr cycle (SDH2); selection on S₁ family (S₁; selection on S₂ bulk (S₂B) and on S₂ family (S₂F); and two other methods-selection on half-sib progeny (HSP) and full-sib family (FSF)- used for the improvement of per se or combining ability values. Analytical expressions for the corresponding expected genetic advances (per growing season) were derived and compared according to the values of the narrow sense heritability and the variance components in an inbred system. SDH1 always appeared as the most efficient method. SDH2 and S₂F were the next best methods for realistic values of parameters. S₁ efficiency was restricted to very high heritabilities and additive variances. Gain due to higher gene fixation in the S₂ families balanced the short cycle of S₁. As the proportion of non-additive and environmental effects increased, SDH2 became more efficient than S₂F, and S₂F more efficient than S₁. S₂B was always the least efficient except when the possibility to reduce the between-plot environmental variance through a larger plot size was taken into account. In that case, S₂B could be more efficient than S₂F for medium to low heritabilities. HSP and FSF appeared only marginally as the second or third most efficient methods. SDH is the best method to improve autogamous crops even though cycle length is 5 yr; however, if haplo-diploidization technologies are not available or are too expensive, a selection scheme based on S₂ family may be the most economical method.

Received for publication June 27, 1995.

This article has been cited by other articles:

				A. Gallais and J. Bordes The Use of Doubled Haploids in Recurrent Selection and Hybrid Development in Maize Crop Sci., December 18, 2007; 47(Supplement_3): S-190 - S-201. [Abstract] [Full Text] [PDF]

				A. Bouchez and A. Gallais Efficiency of the Use of Doubled-Haploids in Recurrent Selection for Combining Ability Crop Sci., January 1, 2000; 40(1): 23 - 29. [Abstract] [Full Text]