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Cadmium and zinc influx characteristics by intact corn (Zea mays L.) seedlings

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Summary

Cadmium and zinc uptake parameters were determined for intact corn (Zea mays L.) seedlings grown for 15 and 22 in nutrient solutions containing levels of Cd and Zn that were similar to those found in soil solutions. Uptake of both elements was assumed to follow Michaelis-Menten kinetics. Calculations were based on the concentrations of free ionic Cd (Cd2+) and Zn (Zn2+) rather than the total solution concentration. Rates of Zn uptake were measured by determining depletion of Zn for periods of up to 30 h from solutions containing initial concentrations of 1.5 and 10μmol Zn 1−1. Depletion curves suggested that Zn uptake characteristics were similar at both levels of Zn in solution. The Imax for Zn uptake decreased from 550 to 400 pmol m−2 root surface s−1 between 16 and 22 d of growth while Km decreased from 2.2 to 1.5 μmol Zn2+ 1−1. Cadmium uptake parameters were measured by controlling Cd2+ activities in nutrient solution betwen 6.3 to 164 nmol l−1 by continuous circulation of nutrient solution through a mixed-resin system. Imax for Cd uptake was 400 pmol m−2 root surface s−1 at 15 and 22 d of growth. The magnitude of Km increased from 30 to 100 nmol Cd2+ 1−1 during this time period. The Km value suggests that corn is efficient for Cd uptake. The results of these uptake studies are consistent with the observed uptake of Zn and Cd by corn seedlings in soils.

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Authors and Affiliations

  1. Department of Agronomy and Soils, Auburn University, 202 Funchess Hall, 36849-4201, AL, USA

    G. L. Mullins

  2. Department of Agronomy, Purdue Univ., 47907, West Lafayette, IN

    L. E. Sommers

  3. Department of Agronomy, Colorado State Univ., 805123, Port Collins, CO, USA

    L. E. Sommers

Authors
  1. G. L. Mullins
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  2. L. E. Sommers
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Mullins, G.L., Sommers, L.E. Cadmium and zinc influx characteristics by intact corn (Zea mays L.) seedlings. Plant Soil 96, 153–164 (1986). https://doi.org/10.1007/BF02374760

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  • DOI: https://doi.org/10.1007/BF02374760

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