1. College of Forestry; Shanxi Agricultural University; Mingxian South Road 1 Taigu Shanxi 030801 PR China
2. College of Agriculture; Shanxi Agricultural University; Mingxian South Road 1 Taigu Shanxi 030801 PR China
3. Pomology Institute, Shanxi Academy of Agricultural Science; Keyuan Road Taigu Shanxi 030815 PR China