1. College of Tobacco Science/Guizhou Key Laboratory for Tobacco Quality Research, Guizhou University, Guiyang, Guizhou 550025, China
2. Hezhou Branch of Guangxi Zhuang Autonomous Region Tobacco Company, Hezhou, Guangxi 542800, China
3. Yangling Vocational and Techincal College, Yangling, Shaanxi 712100, China
4. Department of Science and Technology, China National Tobacco Corporation Guangxi Zhuang Autonomous Region Company, Nanning, Guangxi 530022, China