1. Institute of Molecular Physiology and Biotechnology of Plants University of Bonn D‐53115 Bonn Germany
2. Department of Plant‐Microbe Interactions Max Planck Institute for Plant Breeding Research D‐50829 Cologne Germany
3. Faculty of Biology, Genetics University of Munich (LMU) Planegg‐Martinsried Germany
4. Leibniz Institute of Plant Biochemistry Halle (Saale) Germany
5. Phytopathology Technische Universität München D‐85350 Freising‐Weihenstephan Germany