1. State Key Laboratory of North China Crop Improvement and Regulation, Hebei Key Laboratory of Plant Physiology and Molecular Pathology, College of Life Sciences, Hebei Agricultural University, Baoding, China
2. State Key Laboratory of North China Crop Improvement and Regulation, College of Agronomy, Hebei Agricultural University; Key Laboratory of Crop Growth Regulation of Hebei Province, Baoding, China
3. Pear Engineering and Technology Research Center of Hebei, College of Horticulture, Hebei Agricultural University, Baoding, China
4. College of Plant Protection, Hebei Agricultural University, Baoding, China