1. State Key Laboratory of Tree Genetics and Breeding Chinese Academy of Forestry Beijing 100091 China
2. Research Institute of Forestry Chinese Academy of Forestry Beijing 100091 China
3. Forest Biotechnology Group Department of Forestry and Environmental Resources North Carolina State University Raleigh NC 27695 USA
4. Department of Biochemistry and DOE Great Lakes Bioenergy Research Center Wisconsin Energy Institute University of Wisconsin Madison WI 53726 USA
5. State Key Laboratory of Tree Genetics and Breeding Northeast Forestry University Harbin 150040 China
6. Department of Forestry Beihua University Jilin 132013 China
7. W.M. Keck FT‐ICR Mass Spectrometry Laboratory Department of Chemistry North Carolina State University Raleigh NC 27695 USA
8. Department of Life Sciences Institute of Plant Biology College of Life Science National Taiwan University Taipei 10617 Taiwan