1. Hubei Key Laboratory of Biologic Resources Protection and Utilization, Hubei Minzu University, Enshi, P. R. China
2. Research Center for Germplasm Engineering of Characteristic Plant Resources in Enshi Prefecture, Hubei Minzu University, Enshi, P. R. China
3. Center for Crop Germplasm Resources, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, P. R. China