Huiyuan Li1, Jingying Li1, Jilin Chen1, Lei Yan1, Lanqin Xia2. 1. Institute of Crop Sciences (ICS), Chinese Academy of Agricultural Sciences (CAAS), Beijing 100081, China. 2. Institute of Crop Sciences (ICS), Chinese Academy of Agricultural Sciences (CAAS), Beijing 100081, China. Electronic address: xialanqin@caas.cn.