1. Keygene, 6700 AE Wageningen, The Netherlands (P.M.B., P.J.D., J.G., M.T.J.B.); University of Amsterdam, Swammerdam Institute for Life Sciences, Department of Plant Physiology, 1098 XH Amsterdam, The Netherlands (P.M.B., K.A., M.A.H., R.C.S.); and University of Göttingen, Department of Forest Zoology and Forest Conservation, 37077 Goettingen, Germany (M.W., S.S.)