1. Crop Science Lab., Faculty of Agriculture; Iwate Univ.; 3-18-8, Ueda, Morioka Iwate 020-8550 Japan
2. Yamase Team; National Agricultural Research Center for Tohoku Region; Shimokuriyagawa Iwate 020-0198 Japan
3. Fujisaka Rice Research Division; Aomori Prefectural Industrial Technology Research Center; 183 Ooaza Ousaka Towada Aomori 034-0041 Japan
4. Rice Breeding Division; Miyagi Pref. Furukawa Agricultural Experiment Station; 88 Fukoku Oosaki Furukawa Oosaki Miyagi 989-6227 Japan