1. Biotechnology Research Center, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan, The International Center for Biotechnology, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, National Institute of Fruit Tree Science, 92-24 Nabeyashiki, Shimo-kuriyagawa, Morioka, Iwate 020-0123, Japan, and Suntory Institute for Bioorganic Research, 1-1-1 Wakayamadai, Shimamoto, Mishima, Osaka 618-8503, Japan