Key Laboratory of Tobacco Biology and Processing Ministry of Agriculture and Rural Affairs/Tobacco Research Institute Chinese Academy of Agricultural Sciences Qingdao 266101 P.R.China;
Key Laboratory of Tobacco Biology and Processing Ministry of Agriculture and Rural Affairs/Tobacco Research Institute Chinese Academy of Agricultural Sciences Qingdao 266101 P.R.China;
Key Laboratory of Tobacco Biology and Processing Ministry of Agriculture and Rural Affairs/Tobacco Research Institute Chinese Academy of Agricultural Sciences Qingdao 266101 P.R.China;
Key Laboratory of Tobacco Biology and Processing Ministry of Agriculture and Rural Affairs/Tobacco Research Institute Chinese Academy of Agricultural Sciences Qingdao 266101 P.R.China;
Liangshan Branch of Sichuan Tobacco Corporation Xichang 615000 P.R.China;
Key Laboratory of Tobacco Biology and Processing Ministry of Agriculture and Rural Affairs/Tobacco Research Institute Chinese Academy of Agricultural Sciences Qingdao 266101 P.R.China;
Baoshan Branch Yunnan Tobacco Company Baoshan 678000 P.R.China;
Hongyunhonghe Tobacco(Group)Co. Ltd. Kunming 650231 P.R.China;
Key Laboratory of Tobacco Biology and Processing Ministry of Agriculture and Rural Affairs/Tobacco Research Institute Chinese Academy of Agricultural Sciences Qingdao 266101 P.R.China;
Key Laboratory of Tobacco Biology and Processing Ministry of Agriculture and Rural Affairs/Tobacco Research Institute Chinese Academy of Agricultural Sciences Qingdao 266101 P.R.China;
auxin; lateral root; formation and elongation; tobacco; NH4+/NO3~ratio;