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This article in JEQ

  1. Vol. 10 No. 1, p. 87-90
     
    Received: Feb 9, 1980
    Published: Jan, 1981


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doi:10.2134/jeq1981.00472425001000010019x

The Effect of Cadmium on Nodulation and N2(C2H2)-Fixation by Dry Beans (Phaseolus vulgaris L.)1

  1. G. T. Vigue,
  2. I. L. Pepper and
  3. D. F. Bezdicek2

Abstract

Abstract

Experiments were conducted to determine the toxicity of Cd on the nodulation, N2(C2H2)-fixation, and growth of dry beans. Plants were grown in the greenhouse with hydroponic solutions to which 0–500 µm Cd/liter had been added. The total N content of shoots, nodule weight, nodule number, and N2(C2H2)-fixation were significantly decreased at 10 µm Cd/liter. Nodulation was completely inhibited at 500 µm Cd/liter. Nodulation and the N2(C2H2)-fixation rate were negatively correlated with solution Cd concentration (r = −0.97).

Cadmium uptake and translocation were slow; therefore, Cd levels were highest in the roots, much lower in the nodules, and lowest in the shoot tissue. For example, at 20 µm Cd/liter, respective tissue Cd levels averaged 431, 80, and 35 µg Cd/g, on a dry weight basis. Cadmium levels in roots or shoots from comparable Cd treatments were essentially the same whether the plants obtained their N by fixation or from nutrient solution NO3.

Root Cd concentrations were exponentially correlated with nodule number, nodule weight, and acetylene reduction, with correlation coefficients of −0.99, −0.99, and −0.97, respectively. Shoot Cd concentrations were logarithmically correlated with nodule number, nodule weight, and acetylene reduction, with correlation coefficients of −0.89, −0.91, and −0.84, respectively.

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