1. Department of Forestry and Landscape Architecture, Konkuk University, Seoul 05029, Korea
2. Plant Propagation and Reproduction Division, Baekdudaegan National Arboretum, Bonghwa 36209, Korea
3. Department of Seed and Seedling Management, National Forest Seed Variety Center, Choongju 27495, Korea
4. Department of Forestry and Landscape Architecture, Graduate School of Agriculture and Animal Science, Konkuk University, Seoul 05029, Korea