Chengjie Chen1, Yuanlong Liu1, Rui Xia2. 1. State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou 510642, China. 2. State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Horticulture, South China Agricultural University, Guangzhou 510642, China. Electronic address: rxia@scau.edu.cn.