1. State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, 1 Weigang Road, Nanjing 210095, China.
2. Maize Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China.
3. Department of Molecular Biosciences and Center for Computational Biology and Bioinformatics, The University of Texas at Austin, Austin, TX 78712, USA.