1. Key Laboratory of Sweet Potato Biology and Biotechnology, Ministry of Agriculture and Rural Affairs/Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis & Utilization and Joint Laboratory for International Cooperation in Crop Molecular Breeding, Ministry of Education, College of Agronomy & Biotechnology China Agricultural University Beijing 100193 China
2. Sanya Institute of China Agricultural University Sanya 572025 China
3. State Key Laboratory of Plant Physiology and Biochemistry, National Maize Improvement Center, Key Laboratory of Biology and Genetic Improvement of Maize, Beijing Key Laboratory of Crop Genetic Improvement China Agricultural University Beijing 100193 China