Max Planck Institute of Molecular Plant Physiology, Department of Lothar Willmitzer, Postfach, 14424 Potsdam, Germany. kose@mpimp-golm.mpg.de|Max Planck Institute of Molecular Plant Physiology, Department of Lothar Willmitzer, Postfach, 14424 Potsdam, Germany. kose@mpimp-golm.mpg.de|Max Planck Institute of Molecular Plant Physiology, Department of Lothar Willmitzer, Postfach, 14424 Potsdam, Germany. kose@mpimp-golm.mpg.de|Max Planck Institute of Molecular Plant Physiology, Department of Lothar Willmitzer, Postfach, 14424 Potsdam, Germany. kose@mpimp-golm.mpg.de