K Yoshihara1, J Hosokawa1, T Kubo1, M Nishiyama1, Y Koba1,2. 1. a Government Industrial Research Institute , Shikoku, 2-3-3, Hananomiya-cho, Takamatsu, Kagawa 761 , Japan. 2. b Department of Bioresource , College of Agriculture, Ehime University , 3-5-7, Tarumi, Matsuyama 790 , Japan.