About the Authors
School of Life Sciences, Northeast Forestry University, Harbin, China
School of Forestry, Northeast Forestry University, Harbin, China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: YZ FQ TJ. Performed the experiments: FQ. Analyzed the data: TJ. Contributed reagents/materials/analysis tools: YZ FQ TJ. Wrote the paper: TJ.