1. School of Biological Sciences (C.A.B.) and Australian Research Council Centre of Excellence for Integrative Legume Research (C.A.B., E.A.D.), The University of Queensland, St Lucia, Queensland 4072, Australia; and Station de Génétique et d'Amélioration des Plantes, Institut J.P. Bourgin, UR254 INRA, F–78000 Versailles, France (C.R.)