Abstract
The nicotine synthesis was examined in the big and fine root tips and in the roots varying in kind, ages and regions of roots, furthermore in the roots grown in the anaerobic and aerobic media. The results obtained were as follows. 1. Nicotine content in the roots of the class C and D whose length were 20-30 mm and 30-40 mm respectively which emerged from tobacco seedlings was higher than that in the other classes. 2. The nicotine content became higher with the increasing distance from growing tip. The root tips in the aerobic water medium produced larger quantities of nicotines than did the anaerobic one. 3. The content and synthesis of nicotine in the fine root tips of the several varieties were higher than in the big roots.
