1. Department of Agronomy, University of Wisconsin , 1575 Linden Dr, Madison, WI 53706 , USA
2. Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada , Lethbridge, AB, T1J 4B1 Canada
3. Genome Sequencing Center, HudsonAlpha Institute for Biotechnology , Huntsville, AL 35806 , USA
4. Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory , Lawrence, CA 94704 , USA