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CROP BREEDING, GENETICS & CYTOLOGY

Efficiency of the Use of Doubled-Haploids in Recurrent Selection for Combining Ability

^a INRA-UPS-INA.PG, Station de Génétique Végétale, Ferme du Moulon, 91190 Gif Sur Yvette, France
^b INA.PG, 16 rue Claude Bernard, 75321 Paris Cedex 05, France
^c INRA-UPS-INA.PG, Station de Génétique Végétale, Ferme du Moulon, 91190 Gif Sur Yvette, France

bouchez{at}mons.inra.fr

In population improvement for combining ability, the use of selfed progenies increases genetic advance per cycle, but it can unduly increase the cycle length. Haplodiploidization (HD) can be very efficient because it induces complete homozygosity in a short period. We compared, from a theoretical approach, the potential of recurrent selection with a tester using doubled haploids (SDHT), with selection with testcrosses of S₀, S₁, or S₂ plants, with or without the use of off-season nurseries, for an annual plant like maize (Zea mays L.). With the same selection intensity, and without off-season nurseries, SDHT with a 4-yr cycle is the most efficient method. Efficiency increases with lower heritability, with an advantage in comparison to the test of S₀ plants (S₀T) of 40 to 50% at low heritability (h² < 0.15) and 12% at high heritability (h² = 0.8). Use of off-season nurseries reduces the advantage of SDHT. With a 3-yr cycle, SDHT remains the best at low heritability with a gain of 27% (for h² = 0.1) in comparison to S₀T with a 2-yr cycle. When using constant effective size, the advantage of SDHT is further reduced or suppressed at the benefit of S₀T in 2 yr. The use of HD in recurrent selection for combining ability has its biggest advantage when heritability is low. Consideration of variety development will give more advantage to HD.

Abbreviations: HD, haplodiploidization • SDHT, single-doubled-haploid descent recurrent selection for combining ability with a tester • S₀T, S₁T, S₂T, recurrent selection for combining ability with a tester with respectively S₀, S₁, S₂ plants

This article has been cited by other articles:

				G. A. Gordillo and H. H. Geiger Alternative Recurrent Selection Strategies Using Doubled Haploid Lines in Hybrid Maize Breeding Crop Sci., May 1, 2008; 48(3): 911 - 922. [Abstract] [Full Text] [PDF]

				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]