1. Frontiers Science Center for Molecular Design Breeding, Key Laboratory of Crop Heterosis and Utilization (MOE), Beijing Key Laboratory of Crop Genetic Improvement, College of Agronomy and Biotechnology, China Agricultural University , Beijing 100193 , China
2. National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research, College of Plant Science and Technology, Huazhong Agricultural University , Wuhan 430070 , China