1. Chair of Root–Soil Interaction, School of Life Sciences, Technical University of Munich , Freising , Germany
2. Chair of Soil Physics, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth , Bayreuth , Germany
3. Department of Horticulture, Faculty of Agriculture, University of Khartoum , Khartoum North , Sudan
4. Humboldt-Universität zu Berlin, Thaer-Institute, Division Urban Plant Ecophysiology , Berlin , Germany
5. Laboratory of Fungal Biology, Institute of Microbiology, Czech Academy of Sciences , Prague , Czech Republic
6. Department of Mycorrhizal Symbioses, Institute of Botany of the Czech Academy of Sciences , Průhonice , Czech Republic