1. Department of Applied Bioresource ScienceEhime University 3‐5‐7 Tarumi Matsuyama Ehime 790‐8566 Japan
2. Department of Material Solutions New Research EngineCorporate R&D, Kaneka Co. Ltd. Osaka 530‐8288 Japan
3. National Institute of Fruit Tree Science NARO, 2‐1 Fujimoto, Tsukuba Ibaraki 305‐8605 Japan
4. Department of Applied Biological ScienceKagawa University 2393 Ikenobe Miki, Kita Kagawa 761‐0795 Japan