1. Biotechnology Research InstituteChonnam National Univ. Gwangju 500‐757 Korea
2. Faculty of Applied Plant ScienceChonnam National Univ. Gwangju 500‐757 Korea
3. Department of Crop, Soil, and Environmental SciencesUniv. of Arkansas 1366 W. Altheimer Drive Fayetteville AR USA 72704
4. Department of Genetic EngineeringChonnam National Univ. Gwangju 500‐757 Korea