The effect of cadmium on nodulation and N2(C2H2)-fixation by dry beans (Phaseolus vulgaris L.)

G. T. Vigue, I. L. Pepper, D. F. Bezdicek

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12 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)87-90
Number of pages4
JournalJournal of Environmental Quality
Volume10
Issue number1
DOIs
StatePublished - Jan 1 1981
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

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