1. State Key Laboratory of Plant Physiology and Biochemistry, Engineering Research Center of Plant Growth Regulator, Ministry of Education & College of Agronomy and Biotechnology, China Agricultural University , No.2 Yuanmingyuan West Road, Haidian, Beijing 100193 , China
2. North China Key Laboratory for Crop Germplasm Resources, Ministry of Education, State Key Laboratory of North China Crop Improvement and Regulation & College of Agronomy, Hebei Agricultural University , Baoding, Hebei 071001 , China
3. College of Plant Science and Technology, Beijing University of Agriculture , Beijing, 102206 , China