1. College of Grassland and Environmental Science, Xinjiang Agricultural University, Urumqi, Xinjiang, China 830052
2. College of Agriculture, Xinjiang Agricultural University, Urumqi, Xinjiang, China 830052
3. Noble Research Institute, 2510 Sam Noble Parkway, Ardmore, Oklahoma 73401
4. Division of Plant and Soil Sciences, West Virginia University, Morgantown, West Virginia 26506-6108
5. Poisonous Plant Research Laboratory, Agricultural Research Service, United States Department of Agriculture, 1150 E. 1400 N., Logan, Utah 84341
6. Department of Plant Pathology, University of Kentucky, Lexington, Kentucky 40546-0312
7. State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu, China 730000