RENSING, STEFAN A., Plant Cell Biology, Faculty of Biology, University of Marburg, Karl-von-Frisch-Str. 8, 35043 Marburg, Germany; SYNMIKRO Center for Synthetic Microbiology, University of Marburg, Karl-von-Frisch-Straße 16, 35043 Marburg, Germany; Signalling Research Centres BIOSS and CIBSS, University of Freiburg, Schaenzlestrasse 18, 79104 Freiburg, Germany, Germany