1. Plant Research International, Bioscience, 6708 PB Wageningen, The Netherlands (R.G.H.I., S.F., K.K., F.L.V., S.d.F., F.v.d.W., A.D.J.v.D., G.C.A.); Consortium for Improved Plant Yield, 6700 AB Wageningen, The Netherlands (R.G.H.I., G.C.A.); Department of Molecular Biology, Max Planck Institute for Developmental Biology, 72076 Tuebingen, Germany (D.P., F.O., M.S.); and Laboratory of Molecular Biol