1. Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, Hainan Province, China
2. College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, 163319, P. R. China
3. Department of Plant and Environmental Protection Sciences, University of Hawaii, Honolulu, HI, 96822
4. Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, Hainan Province, China.