Full-sib reciprocal recurrent selection with the use of doubled Haploids

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.

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