Elsorra E. Idris1, 2, H. Bochow2, H. Ross3, R. Borriss1 1 Humboldt University, Berlin, Institute of Biology, Dept. of Bacterial Genetics, Chausseestr. 117, D-10115 Berlin, Germany 2 Humboldt University, Berlin, Faculty of Agriculture and Horticulture, Institute of Horticultural Sciences, Sect. of Phytomedicine, Lentzeallee 55/57, D-14195 Berlin-Dahlem, Germany 3 Humboldt University, Berlin, Ins...