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A study was made of the course of the alkaloid content in the aerial parts of both 1- and 2-year-old A. belladonna during growth. This content is not steady. One-year plants reach the maximum content during or just after flowering, when the plant bears a few green berries, while 2-year plants reach the maximum content in a very young stage. During flowering, however, the content drops to a low level to reach a peak again when the plant bears a good many green berries.

Interrelation of alkaloid content and stage of development of 1- and 2-year-old Atropa belladonna L.