Abstract
Nicotiana rustica var. brasilli plants were grown inside a specially constructed chamber and supplied with 14CO 2, 3H 2O, and 15N as nitrate. Despite the fact that the 14CO 2 activity was only half that of HTO, the incorporation of 14C into alkaloids was higher than 3H. Generally, the highest specific activity in nicotine of 14C and 3H, as well as the highest excess 15N, was found in the leaves of the middle part of a plant. In plants of this variety sampled at an actively growing stage, a considerably high percentage of activity was found in alkaloids other than the principal alkaloid (nicotine), including nornicotine, anatabine, and anabasine. From the incorporation of 14C and 3H, a special role of anatabine in the nornicotine-nicotine conversion system is indicated. Generally, the ratios of 14C/ 15N, 3H/ 15N, and 14C/ 3H in nicotine was found to increase from root to top leaves; this is parallel to the distribution of the amount of nicotine found in these plants.
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