1. State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, Harbin 150040, China
2. Forest Biotechnology Group, Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, North Carolina 27695
3. Department of Life Sciences and Institute of Plant Biology, College of Life Science, National Taiwan University, Taipei 10617, Taiwan
4. Department of Crop and Soil Science, North Carolina State University, Raleigh, North Carolina 27695