1. Crop Science Laboratory, Faculty of Agriculture; Iwate University; 3-18-8, Ueda, Morioka Iwate 020-8850 Japan
2. Iwate Biotechnology Research Center; 22-174-4, Narita, Kitakami Iwate 024-0003 Japan
3. Graduate School of Agricultural and Life Sciences; The University of Tokyo; 1-1-1 Yayoi, Bunkyo-ku Tokyo 989-6227 Japan
4. Miyagi Prefectural Furukawa Agricultural Experiment Station; 88 Fukoku, Oosaki, Furukawa Miyagi 989-6227 Japan