1. Graduate School of Bioagricultural Sciences Nagoya University Nagoya Japan
2. Institute of Plant Science and Resources (IPSR) Okayama University Kurashiki Japan
3. Agricultural Research InstituteHOKUREN Federation of Agricultural Cooperatives Naganuma Hokkaido Japan
4. Hokkaido Sugar Co., Ltd Honbetsu Hokkaido Japan
5. Kitami Agricultural Experiment Station Kunneppu Hokkaido Japan