[1] Purdue Univ, Dept Hort, W Lafayette, IN 47907 USA
[2] Univ Zurich, Inst Plant Biol, Basel Zurich Plant Sci Ctr, CH-8007 Zurich, Switzerland
[3] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA
[4] Ruhr Univ Bochum, Lehrstuhl Pflanzenphysiol, D-44801 Bochum, Germany