Multitrait selection possibilities within a group of Douglas-fir open pollinated families chosen for their stability on two sites
1986
Bastien, Jean-Charles | Roman-Amat, Bernard | Unité de recherche Amélioration, Génétique et Physiologie Forestières (AGPF) ; Institut National de la Recherche Agronomique (INRA)
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Show more [+] Less [-]English. 122 open-pollinated Douglas-Fir (Pseudotsuga menziesii Mirb. Franco) progenies are present in a two site progeny test. In a first step, 56 progenies are chosen for being stable on both sites on four traits, i.e. height growth, flushing date, stem sinuosity and branch angle. In a second step, two kinds of multitrait index combined selection procedures are compared (1) within-site on 122 progenies, (2) between-site on 56progenies.The group of 56 stable progenies is characterised as follow: lower heritabilities on each trait are associated with generally more favourable genetic correlations between traits; expected genetic gains, in selection compromise, are of same magnitude as within each site; number of unrelated clones which can be selected is a reduced by a 2 to 3 ratio compared to within -site selection at the same rate.
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