1. Department of Biology; University of Fribourg; Switzerland
2. Zurich-Basel Plant Science Center, Department of Environmental Sciences, Botany; University of Basel; Switzerland
3. Center for Genomics and Systems Biology, Department of Biology; New York University; New York USA
4. Department of Bacteriology; University of Wisconsin-Madison; USA
5. URM Agroécologie, AgroSup Dijon; CNRS, INRA, Univ. Bourgogne Franche-Comté; F-21000 Dijon France
6. Biochimie et Physiologie Moléculaire des Plantes; CNRS, INRA, Montpellier SupAgro, Univ. Montpellier; 34060 Montpellier France