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The Influence of Temperature, pH, and Metabolic Inhibitors on Uptake of Lead by Plant Roots¹

ABSTRACT

Excised roots of selected crop plants were exposed to 10 µg/ml of lead nitrate in the presence of 2,4-dinitrophenol or sodium azide at 10^–4 and 10^–5 molar concentration. Additionally, roots were exposed to lead nitrate at pH 4.5, 5.5, and 7.0, and at temperatures of 4 and 24C. Lead uptake was not influenced by metabolic inhibitors or low temperature, but was dependent on solution pH, suggesting that the process does not require energy expenditure by the plant.

Key Words: heavy metals

¹ Contribution from Dep. of Botany and Plant Pathology, Colorado State University, Ft. Collins 80521. From a thesis submitted by the senior author to the Graduate Faculty of Colorado State University in partial fulfillment of the requirements for the Ph.D. degree. This research was funded by The Research Applied to National Needs Directorate of the National Science Foundation under grants GI-4 and GI-3481 3X.

² Research Biologist, AC & S Division 3M Company, St. Paul, MN 55101, and Associate Professor, Dep. of Botany and Plant Pathology, Colo. State Univ., Ft. Collins 80521, respectively.

Received for publication December 21, 1974.