1. Department of Bacteriology, University of Wisconsin, Madison, Wisconsin 53706
2. Department of Agronomy, University of Wisconsin, Madison, Wisconsin 53706
3. Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31326, Castanet-Tolosan, France
4. Department of Forest Ecosystems and Society, Oregon State University, Corvallis, Oregon 97331
5. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
6. Department of Biology and Microbiology, South Dakota State University, Brookings, South Dakota 57007
7. Laboratoire des Interactions Plantes-Microorganismes, Université de Toulouse, INRA, CNRS, 31326, Castanet-Tolosan, France
8. Laboratoire Evolution et Diversité Biologique, Université de Toulouse, UPS, CNRS, IRD, 31077 Toulouse, France