1. Key Laboratory of Grassland Resources of the Ministry of Education, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture and Rural Affairs, Inner Mongolia Key Laboratory of Grassland Management and Utilization, College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, China
2. Department of Plant Sciences, Laboratory of Molecular Biology, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
3. Department of Renewable Resources, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
4. State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China
5. Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, China
6. Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada