Center for Computational Biology at Beijing Forestry University, China.|Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, School of Landscape Architecture at Beijing Forestry University, Beijing, China.|Department of Statistics at The Pennsylvania State University, USA.|Center for Computational Biology at Beijing Forestry University, Beijing, China.|Jiangsu Key Laboratory for Poplar Germplasm Enhancement and Variety Improvement at Nanjing Forestry University, Nanjing, China.|Center for Computational Biology at Beijing Forestry University, Beijing, China.|Forest Management in the Institute of Forest Resource Information Techniques at Chinese Academy of Forestry, Beijing, China.|Jiangsu Key Laboratory for Poplar Germplasm Enhancement and Variety Improvement at Nanjing Forestry University, Nanjing, China.|Center for Computational Biology, College of Biological Sciences and Technology, Beijing Forestry University, Beijing, China.