1. Kizakura Sake Brewing Co. Ltd., 223 Shioyamachi, Fushimi-ku, Kyoto 612-8046, Japan.
2. Corresponding author. Phone: +81-75-611-4101. Fax: +81-75-622-3510. E-mail: furukawa@kzkappa.co.jp
3. Laboratory of Genetic Engineering, Faculty of Agriculture, Kyoto Prefectural University, Shimogamo, Kyoto 606-8522, Japan.
4. Phytoculture Co. Ltd., 5-18-14 Sekime, Jyoto-ku, Osaka 536-0008, Japan.
5. Division of Basic Research, Kyoto Prefectural Institute of Agricultural Biotechnology, 74 Seika, Kyoto 619-0244, Japan.