1. Molecular Biotechnology Laboratory of Triticeae Crops, Huazhong Agricultural University, Wuhan 430070, P.R. China
2. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Centre for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, the Chinese Academy of Sciences, Wuhan 430071, P.R. China
3. Graduate School of Chinese Academy of Sciences, Beijing 100049, P.R. China
4. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, P.R. China
5. National Center of Plant Gene Research (Wuhan), Wuhan 430070, P.R. China