Figure 5.

Alkaloid contents of the tips and of the remaining older parts of H. albus roots cultured under Fe deficiency and Fe repletion. Roots were treated with and without Fe for 5 days, and then harvested. Roots were separated into the tips (ca. 1.0–1.5 cm in length) and the remaining parts, and then dried at 50°C overnight. Results are means of three independent experiments, and bars indicate standard deviations of the means.