1 National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China; State Key Laboratory of Agro-Biotechnology, College of Biological Sciences, China Agricultural University, Beijing 100094, China.
2 National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China.
3 State Key Laboratory of Agro-Biotechnology, College of Biological Sciences, China Agricultural University, Beijing 100094, China.
4 National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China. Electronic address: xwang@cau.edu.cn.