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Yield and grain protein concentration in bread wheat: a review and a study of multi-annual data from a French breeding program [Triticum aestivum L.] [2003]
Oury, F.X. (Institut National de la Recherche Agronomique (INRA), Clermont Ferrand, Estrées Mons, Le Rheu Genlis (France). Station d´Amélioration des Plantes); Bérard, P. (Institut National de la Recherche Agronomique (INRA), Clermont Ferrand, Estrées Mons, Le Rheu Genlis (France). Station d´Amélioration des Plantes); Brancourt-Hulmel, M. (Institut National de la Recherche Agronomique (INRA), Clermont Ferrand, Estrées Mons, Le Rheu Genlis (France). Station d´Amélioration des Plantes); Heumez, E. (Institut National de la Recherche Agronomique (INRA), Clermont Ferrand, Estrées Mons, Le Rheu Genlis (France). Station d´Amélioration des Plantes); et al.
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A review of the literature shows that it is difficult to assess the strength of the relationship between yield and grain protein concentration (GPC) in bread wheat, as the negative correlation between the two traits appears highly variable. A study over 14 years of multi-site trials conducted between 1977 and 1999 (82 site x year combinations) shows that the yield-GPC relationship is often masked by environmental effects. However, when environmental effects are reduced in comparison to genotype effects, either by studying groups of genotypes exhibiting high genetic variability for the two traits or by using the mean values obtained from a network corresponding to a wide range of environments, a strong negative relationship is revealed (coefficient of determination of at least 50%). This can pose considerable selection problems if the aim is to continue increasing productivity without reducing GPC. Nonetheless, a number of wheat lines does not fall within the boundaries of this general relationship. Identifying such genotypes is not possible in early generations, but it can be done by systematically measuring the two traits in networks on advanced generation breeding lines
