1. Laboratory of Plant Physiology, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-Cho, Sakyo-Ku, Kyoto 606-8502, Japan
2. Plant Functional Genomics Research Group, Plant Science Center, RIKEN Yokohama Institute, Tsurumiku, Yokohama, Kanagawa 2300-0045, Japan