Acknowledgment
We greatly acknowledge field and lab assistance from Dr. Thomas Niemeyer and Christoph Stegen. This research was financed by the BonaRes soil sustainability program of the German Ministry of Education and Research (BBF) within the INPLAMINT project with the grant numbers: 031B1062F (Vicky M. Temperton), 031B1062C (Michael Schloter), and 031B1062D (Michael Bonkowski). We thank IPK Leibniz-Institut, Gatersleben for kindly providing seeds of wild barley for research purposes.