1. Faculty of Agriculture; Iwate University; 3-18-8 Ueda Morioka Iwate 020-8550 Japan
2. Crop and Environmental Sciences Division; International Rice Research Institute; DAPO Box 7777 Metro Manila the Philippines
3. Department of Agronomy; Kansas State University; Manhattan KS 66506 USA
4. Agro-Environmental Research Division; NARO Tohoku Agricultural Research Center; Morioka Iwate 020-0198 Japan
5. Département BIOS; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD); Umr AGAP 34398 Montpellier France
6. Iwate Biotechnology Research Center; 22-174-4, Narita Kitakami Iwate 024-0003 Japan