1. Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1318, Institut Jean-Pierre Bourgin, Saclay Plant Sciences, F–78000 Versailles, France (T.V., E.F.C., H.T., E.B., T.D., S.P., S.R., H.H., M.G., S.V.);
2. AgroParisTech, Institut Jean-Pierre Bourgin, F–78000 Versailles, France (T.V., E.F.C., H.T., E.B., T.D., H.H., M.G., S.V.); and
3. Wageningen University and Research Plant Breeding, Wageningen University and Research Centre, 6708 PD Wageningen, The Netherlands (N.M., L.M.T.)