1. U.S. Dairy Forage Research Center, Agricultural Research Service, U.S. Department of Agriculture, Madison, Wisconsin 53706; Department of Forestry, University of Wisconsin, Madison, Wisconsin 53706; Laboratoire de Chimie Biologique, Institut National Agronomique, 78850 Thiverval-Grignon, France; Unité Amélioration, Génétique et Physiologie Forestières, INRA Orleans, B.P. 20619 Ardon, 45166 Olivet, France; Departement Plantengenetica, Vlaams Interuniversitair Instituut voor Biotechnologie, Ledeganckstraat...