1 State Key Laboratory of Wheat and Maize Crop Science, College of Agronomy, and Center for Crop Genome Engineering, Henan Agricultural University, Zhengzhou 450002, China.
2 Department of Biological Sciences, University of South Carolina, Columbia SC 29208, USA.
3 State Key Laboratory of Wheat and Maize Crop Science, College of Agronomy, and Center for Crop Genome Engineering, Henan Agricultural University, Zhengzhou 450002, China. Electronic address: zhenghongyuan@henau.edu.
4 Department of Biological Sciences, University of South Carolina, Columbia SC 29208, USA. Electronic address: zfu@mailbox.sc.edu.