1. College of Agronomy and Biotechnology; China Agricultural University; Beijing 100193 China
2. Department of Agricultural Soil Science; University of Goettingen; Goettingen 37077 Germany
3. National Engineering Laboratory of Wheat and Maize; Maize Research Institute, Shandong Academy of Agricultural Sciences; Jinan 250100 China
4. School of Environment, Natural Resources and Geography; Bangor University; Gwynedd LL57 2UW UK
5. National Oat Improvement Center of China; Baicheng Academy of Agricultural Sciences; Baicheng City 137000 China