1. INRA, Univ. Nice Sophia Antipolis, CNRS UMR 1355‐7254 Institut Sophia Agrobiotech 06900 Sophia Antipolis France
2. Laboratoire des Interactions Plantes‐Microorganismes UMR CNRS 2594 – INRA 441 31326 Castanet Tolosan France
3. Department of Plant Biochemistry, Center for Plant Molecular Biology University of Tübingen 72076 Tübingen Germany