1. State Key Laboratory of Tree Genetics and Breeding; Northeast Forestry University; Harbin China
2. State Key Laboratory of Tree Genetics and Breeding; Chinese Academy of Forestry; Beijing China
3. College of Life Sciences; Dezhou University; Dezhou Shandong China
4. College of Forestry; Northwest A & F University; Yangling ShaanXi China
5. Forest Biotechnology Group; Department of Forestry and Environmental Resources; North Carolina State University; Raleigh NC USA