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Genetic Improvement of Agronomic Traits of Winter Wheat Cultivars Released in France from 1946 to 1992

M. Brancourt-Hulmel*,a, G. Doussinaultb, C. Lecomtec, P. Bérardd, B. Le Buanece and M. Trottetb

a INRA, Unité de Génétique et d'Amélioration des Plantes, 80200 Estrées-Mons, France
b INRA, Unité de Génétique et d'Amélioration des Plantes, 35650 Le Rheu, France
c INRA, Station de Génétique et d'Amélioration des Plantes, 17 rue Sully, BV 1540, 21034 Dijon Cedex, France
d INRA, Unité de Génétique et d'Amélioration des Plantes, Domaine de Crouelle, 63000 Clermont-Ferrand, France
e FIS/ASSINSEL Chemin du Reposoir 7, 1260 Nyon, Switzerland



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  		Fig. 1. Changes in wheat grain yield in France from 1900 to 2000.

 


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  		Fig. 2. Slopes of joint regression and main grain yield for the cultivars. The slope estimates the cultivar response to the fertility of each environment. Indication of the variability of the estimates is given by the ellipses at the 0.05 probability level. Mean grain yield is symbolized with a vertical dashed line. The horizontal line separates genotypes specifically adapted to favorable environments (slope > 1) and genotypes specifically adapted to unfavorable environments (slope < 1). Codes of the cultivars are the same as in Table 2.

 




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