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CROP BREEDING & GENETICS-NOTES

Full-Sib Reciprocal Recurrent Selection with the Use of Doubled Haploids

Station de Génétique Végétale, INRA-UPS-CNRS-AgroParisTech, Ferme du Moulon, 91190, Gif sur Yvette, France

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

Doubled haploids are increasingly used in plant breeding, especially in maize (Zea mays L.) breeding. Their use can deeply change the interest of recurrent selection for the development of new hybrids. To show this, a full-sib reciprocal recurrent selection scheme using doubled haploids (DH FS-RRS) is proposed. Doubled haploid lines are derived from each population and they are then pair-crossed, one line from one population being crossed to one line from the other population. After evaluation of the progenies, for each population, the parents of the best crosses are selected and intercrossed. As compared to the reciprocal recurrent selection using S₀ plants (S₀ FS-RRS), DH FS-RRS can be easily applied to maize in the absence of prolificacy. It is shown that, in the case of maize, for the same decrease in the effective population size and the same average number of plots per year, and with the use of winter nursery, the expected genetic advance per year for DH FS-RRS can be 38.6% better than that for S₀ FS-RRS. The main advantage of DH FS-RRS is to allow direct hybrid development.

Abbreviations: DH, doubled haploids • DH FS-RRS, full-sib reciprocal recurrent selection with the use of doubled haploids • FS-RRS, full-sib reciprocal recurrent selection • S₀, non-inbred plant from a random mating population • S₀ FS-RRS: full-sib reciprocal recurrent selection with the use of S₀ plants • S₁ family, family from self-fertilization of S₀ plant