1. Department of Plant and Environmental Sciences; The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram; Jerusalem 9190401 Israel
2. Department of Chemical Engineering; Shamoon College of Engineering; Beer Sheva 84100 Israel
3. Institut für Biowissenschaften, Abteilung Pflanzenphysiologie, Universität Rostock; A.-Einstein-Str. 3 Rostock D-18059 Germany