1. Department of Agronomy and Horticulture, Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
2. Department of Statistics, Iowa State University, Ames, Iowa, USA
3. Environmental Genomics and System Biology, Lawrence Berkeley National Laboratory, Berkeley, California, USA
4. Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, California, USA
5. Department of Horticulture and Landscape Architecture, Colorado State University, Colorado State University, Fort Collins, Colorado, USA