1. 1Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, South Korea; Research Institute for Agriculture and Life Science, Seoul National University, Seoul 151-921, South Korea
2. 2Nambu Forest Experiment Station, Korea Forest Research Institute, Chinju 660-300, South Korea
3. 3Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, South Korea
4. 4Division of Forest Biology, Korea Forest Research Institute, Seoul 130-712, South Korea
5. 5Division of Forest Biology, Korea Forest Research Institute, Seoul 130-712, South Korea