Abstract
Pb2+ Uptake Short-term experiments were carried out to understand the mechanism of absorption and transport of Pb2+ in young pea seedlings. It was found that considerable fraction of Pb2+ absorbed could be exchanged with Ca2+ in the medium. Furthermore, increasing concentrations of Ca2+, Mg2+, or K+ in the absorption medium significantly reduced the absorption of Pb2+. Uptake of Pb2+ was largely non-metabolic, as shown by its insensitivity to temperature changes and the presence of a metabolic inhibitor.
Presence of Pb2+ in the medium was highly inihibitory to the absorption of micronutrients, viz., Fe2+, Mn2+, and Zn2+. The inhibition appeared to be of a physical nature, like blocking the entry or binding of the ions to the ion-carrier.
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.