1. Contribution from the Department of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan, Institute of Medicinal Molecular Design Inc., 5-24-5 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Department of Bioresource Science, College of Agriculture, Ibaraki University, Ami-machi, Inashiki-gun, Ibaraki 300-0393, Japan, and Department of Bioresource Engineering, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata 997-8555, Japan