1. Division of Fruit Production and Postharvest Science, Institute of Fruit Tree and Tea Science, NARO, 2-1 Fujimoto, Tsukuba, Ibaraki 305-8605, Japan
2. Fruit Tree Division, Kagoshima Prefectural Institute of Agricultural Development, 2200 Oono, Kinpo, Minamisatsuma, Kagoshima 899-3401, Japan
3. Department of Deciduous Fruit Tree, Fruit Tree Research Institute, Kumamoto Prefectural Agricultural Research Center, 2566 Toyofuku, Matsubase, Uki, Kumamoto 869-0524, Japan
4. Northern Kumamoto Administrative Headquarters, Kumamoto Prefectural Government, Tamana, Kumamoto 865-0016, Japan
5. Laboratory of Fruit Growing and Breeding, Tottori Prefectural Horticultural Research Center, 2048 Yurashuku Hokuei, Tottori 689-2221, Japan