1. Department of Crop Science, College of Agriculture, Central Luzon State University, Science City of Muñoz 3120, Philippines
2. Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
3. Crop Biotechnology Center, Philippine Rice Research Institute, Science City of Muñoz 3119, Philippines
4. International Center for Research and Education in Agriculture, Nagoya University, Nagoya 464-8601, Japan