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The Use of Doubled Haploids in Recurrent Selection and Hybrid Development in Maize

^a INRA-UPS-CNRS-INAPG, Station de Génétique Végétale, Ferme du Moulon, 91190 Gif sur Yvette, France
^b UMR Amélioration des Plantes, INRA-UBP, 234 Avenue du Brezet, 63000 Clermont-Ferrand, France

View larger version (34K): [in this window] [in a new window]   Figure 1. Genetic advance per year, in genetic standard deviations, according to S0 heritability, with the use of off-season generations and the same selection intensity (PS0= 0.05).

View larger version (32K): [in this window] [in a new window]   Figure 2. Genetic advance per year in standard deviations according to S0 heritability, with the use of off-season generations, the same investment in trials per year and the same effective population size for a given duration.

View larger version (22K): [in this window] [in a new window]   Figure 3. Relative efficiency of the methods according to S0 heritability, with the use of off-season generations, the same investment in trials per year and the same effective population size for a given duration.

View larger version (13K): [in this window] [in a new window]   Figure 4. Expected total genetic advance at the level of variety development (VD) from DHT-RS versus S0T-RS. Predicted results for S0T-RS in 2 yr + 3 yr for VD are the same as for DHT-RS in 4 yr and one year more for VD. For the computation we have considered constraints given in Table 3, and hS02= 0.50. Lines for DHT 4 yr + VD one year and S0T 2 yr + VD 3 yr are the same.

View larger version (12K): [in this window] [in a new window]   Figure 5. Expected total genetic advance at the level of variety development (VD) from DHT-RS versus S1T-RS. For the computation we have considered constraints given in Table 3, and hS02 = 0.50.