1. Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food, and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel (D.S., N.S., O.S., S.L., A.G., A.K., H.C., M.M.); and
2. Max Planck Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany (Y.B., S.O., A.R.F., L.W.)