1. Plant Biotechnology Resource and Outreach Center, Department of Horticulture, Michigan State University, East Lansing, MI,USA
2. Shandong Institute of Pomology, Shandong Academy of Agricultural Sciences, Taian, P. R. China
3. Plant Production Department, Faculty of Environmental Agricultural Sciences, Arish University, El-Arish, Egypt
4. College of Horticulture, South China Agricultural University, Guangzhou, P. R. China