Beijing Advanced Innovation Center for Tree Breeding By Molecular Design,Beijing Forestry University,Beijing 100083,People’s Republic of China;
College of Biological Sciences and Biotechnology,Beijing Forestry University,Beijing 100083,People’s Republic of China;
National Engineering Laboratory for Tree Breeding,Beijing Forestry University,Beijing 100083,People’s Republic of China;
Cell wall; Confocal Raman microspectroscopy; Lignin; Paraffin section; Populus tomentosa;