1. State Key Laboratory of Efficient Production of Forest Resources, Ministry of Education, Beijing Forestry University, Beijing 100083, China
2. College of Horticulture, Xinjiang Agricultural University, Urumqi 830052, China
3. Department of Plant Science, University of California, Davis, CA 95616, USA
4. Research Institute of Oil Tea Camellia, Hunan Academy of Forestry, Changsha 410004, China