1. Department of Plant and Microbial Biology, University of Zurich, Zollikerstrasse 107, 8008 Zurich, Switzerland.
2. Zurich-Basel Plant Science Center, Zurich, Switzerland.
3. Laboratory of Cell and Molecular Biology, Institute of Biology, University of Neuchâtel, Rue Emile Argand 11, CH-2000 Neuchâtel, Switzerland.
4. Center for Organismal Studies (COS), University of Heidelberg, Im Neuenheimer Feld 230, 69120 Heidelberg, Germany.
5. Department of Molecular Plant Biology, University of Lausanne, UNIL-Sorge, 1015 Lausanne, Switzerland.