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Alkaloid Changes in Tobacco Seeds during Germination ¹

^a Department of Agronomy, University of Kentucky, Lexington, Kentucky 40506

Nicotine, nornicotine, anabasine, and anatabine, normally found in growing and mature tobacco (Nicotiana tabacum L.) plants, were extracted and quantified from mature tobacco seeds and young tobacco seedlings. The rate of net alkaloid disappearance and accumulation in tobacco seedlings was related to phases of germination.

In general, the increased rate of germination associated with higher temperatures also increased the rate of initial loss of alkaloids and the subsequent rate of accumulation of alkaloids. Maximum alkaloid accumulation in 144-hour-old seedlings cultured with 10-hour day occurred at 27 C. Following an 8-hour photoinduction period, seeds germinated in darkness accumulated greater amounts of alkaloids than seeds exposed to light each day. Seeds germinated in darkness for 96 hours, following the 8-hour photoinduction period, and then exposed to light each day accumulated the greatest amounts of alkaloids.

³ To whom requests for reprints should be sent.

¹ This investigation was supported by Agricultural Research Service, United States Department of Agriculture Contract No. 12-14-100-9523. Paper No. 73-03-17 from the Kentucky Agricultural Experiment Station, published with the approval of the Experiment Station Director and the Area Director at Beltsville, Md., Northeastern Region, ARS, United States Department of Agriculture.

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