1. Cereal Research Ctr., Nisshin Flour Milling Co., Ohimachi, Iruma, Saitama 356 Japan.
2. Corresponding author. E-mail: tnaka@tnaes.affrc.go.jp
3. Tohoku National Agricultural Exp. Stn., Kuriyagawa, Morioka, Iwate 020-01 Japan.
4. Chugoku National Agricultural Exp. Stn., Nishifukatsu, Fukuyama, Hiroshima 721.