1. State Key Laboratory for Agrobiotechnology and Key Laboratory of Crop Heterosis and Utilization (MOE) Beijing Key Laboratory of Crop Genetic Improvement China Agricultural University Beijing 100193 China
2. National Plant Gene Research Centre (Beijing) Beijing 100193 China
3. Department of Plant Genetics & Breeding China Agricultural University Yuanmingyuan Xi Road No. 2 Haidian District Beijing 100193 China