Affiliation: | 1. Department of Plant &2. Soil Biology , University of California , 108 Hilgard Hall, Berkeley, CA, 94720, USA;3. Institute of Plant Physiology , Biological Research Center , P.O. Box 521, Szeged, H‐6701, Hungary;4. Soil Biology , University of California , 108 Hilgard Hall, Berkeley, CA, 94720, USA |