1. Department of Plant Molecular Biology, University of Lausanne, Biophore Building, 1015 Lausanne, Switzerland.
2. Faculty of Biology, Genetics, University of Munich, Biocenter Martinsried, Grosshaderner Straße 2-4, 82152 Martinsried, Germany.
3. Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK.
4. Division of Plant Sciences, National Institute of Agrobiological Sciences, 2–1–2 Kannondai, Tsukuba, Ibaraki 305–8602, Japan.
5. Botanical Institute, Molecular Cell Biology, Karlsruhe Institute of Technology, Kaiserstraße 2, 76131 Karlsruhe, Germany.
6. Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, D-50829 Cologne, Germany.