ACKNOWLEDGEMENTS
We would like to thank Tanita Cheevaphantusri, Luke Evans, Nesatalu Hiese, Jacob Miller, Kathleen Haiby, and Richard Shuren for help with field work. This work was supported by BioEnergy Science Center, Center for Bioenergy Innovation and the Plant-Microbe Interfaces Scientific Focus Area by the Office of Biological and Environmental Research in the U.S. Department of Energy Office of Science. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for the United States Department of Energy under contract DE-AC05-00OR22725. This study was supported by Department of Energy (DOE) Office of Science, Office of Biological and Environmental Research (BER) Grant DE-SC0018196, US Department of Agriculture Grant 2012-34103-19771 (to J.M.L.), and the National Science Foundation Dimensions of Biodiversity Program (1542509 to S.D. and 1542479 to K.K.-R.).