Mapping quantitative trait loci controlling silking date in a diallel cross among four lines of maize |
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Authors: | A Rebaï P Blanchard D Perret P Vincourt |
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Institution: | (1) INRA, Unité de Biométrie et d’Intelligence Artificielle, Auzeville B.P. 27, 31326 Castanet-Tolosan, France, FR;(2) Rustica Prograin Génétique, Domaine de Sandreau, 31700 Toulouse, France, FR |
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Abstract: | We describe and apply an interval mapping method for quantitative trait locus (QTL) detection using F3 and testcross progenies derived from F2 populations obtained from a diallel cross among four elite lines of maize. Linear model-based procedures were used for the
test and estimation of putative QTL effects together with genetic interactions including epistasis. We mapped QTL associated
with silking date and explored their genetic effects. Ten QTL were detected, and these explained more than 40% of the phenotypic
variance. Most of these QTL had consistent and stable effects among genetic backgrounds and did not show significant epistasis.
QTL-by-environment interaction was important for four QTL and was essentially due to changes in magnitude of allelic effects.
These results show the efficiency of our method in several genetic situations as well as the power of the diallel design in
detecting QTL simultaneously over several populations.
Received: 2 September 1996 / Accepted: 20 December 1996 |
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Keywords: | Keys words QTL RFLP markers Interval mapping Diallel Maize |
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