1. Department of Molecular Genetics, National Institute of Agrobiological Resources, Tsukuba, Ibaraki 305-8602, Japan
2. Core Research of Science and Technology (CREST), Tiyoda-ku, Tokyo 101-0062, Japan
3. Bioscience Research Department, TOAGOSEI Corporation, Tsukuba, Ibaraki 300-2611, Japan
4. Nara Institute of Science and Technology, Ikoma, Nara 630-0101, Japan
5. Hokuriku National Agricultural Experiment Station, Joetsu, Niigata 943-0154, Japan
6. National Institute for Environmental Studies, Tsukuba, Ibaraki 305-0053, Japan