Horticulture College, Gansu Agricultural University, Lanzhou 730070, P.R.China;
Institute of Fruit and Floriculture Research, Gansu Academy of Agricultural Sciences, Lanzhou 730070, P.R.China;
Horticulture College, Gansu Agricultural University, Lanzhou 730070, P.R.China;
Institute of Fruit and Floriculture Research, Gansu Academy of Agricultural Sciences, Lanzhou 730070, P.R.China;
Institute of Fruit and Floriculture Research, Gansu Academy of Agricultural Sciences, Lanzhou 730070, P.R.China;
Institute of Fruit and Floriculture Research, Gansu Academy of Agricultural Sciences, Lanzhou 730070, P.R.China;