1. Department of Horticulture (A.B.D., D.Z., L.M.A.D., R.R.T., J.A.P., J.W.B., J.C.S.) and Center of Membrane Sciences, Department of Chemistry (J.L.D., D.A.B.), University of Kentucky, Lexington, Kentucky 40546; and Department of Plant Sciences, Weizmann Institute of Science, Rehovot 76100, Israel (A.A.L.)