1. National Institute of Crop Science, NARO, 2-1-18 Kannondai, Tsukuba, Ibaraki 305-8518, Japan
2. National Agricultural Research Center for Kyushu Okinawa Region, NARO, 496 Izumi, Chikugo, Fukuoka 833-0041, Japan
3. National Food Research Institute, NARO, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan
4. Tochigi Agricultural Experiment Station, 2920 Ohtsuka-cho, Tochigi, Tochigi 328-0007, Japan
5. Department of Nutrition and Food Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo 112-8610, Japan