Affiliation: | 1. National Engineering Laboratory for Forest Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, P. R. China;Department of Biology and Chemistry, Baoding University, Baoding 071000, P. R. China 2. National Engineering Laboratory for Forest Tree Breeding, College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, P. R. China 3. Beijing Institute of Landscape Architecture, Beij ing 100102, P. R. China 4. Hardwood Tree Improvement and Regeneration Center(HTIRC), Department of Forestry and Natural Resources, Purdue University,West Lafayette, Indiana 47907, USA |