1. College
of Horticulture, Gansu Agricultural University, Yingmen Village, Anning District, Lanzhou, Gansu 730070, People’s Republic of China
2. Vegetable Institution of Gansu Academy of Agricultural Science, Anning District, Lanzhou, Gansu 730070, People’s Republic of China
3. Department
of Horticulture, Faculty of Agriculture (FoA), University for Development Studies,
Post Office Box TL 1882, Tamale, Ghana