1. College of Grassland, Resources and Environment, Key Laboratory of Grassland Resources, Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of Ministry of Agriculture, Inner Mongolia Agricultural Univ. Hohhot China
2. Key Laboratory of Molecular Epigenetics of Ministry of Education, Key Laboratory of Vegetation Ecology, Ministry of Education, School of Life Sciences, Northeast Normal Univ. Changchun China
3. Maize Research Inst., Inner Mongolia Academy of Agricultural&Animal Husbandry Sciences Hohhot China