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Effect of nickel on the proliferation of nitrogen-fixing bacteria


, : Effect of nickel on the proliferation of nitrogen-fixing bacteria. Polish Journal of Natural Sciences 20(2): 595-603

A laboratory experiment was conducted to test the effect of nickel on the proliferation of the following soil bacteria suspended in liquid media: Azotobacter spp., Arthrobacter spp., Rhizobium leguminosarum bv. viciae and Bradyrhizobium spp. (lupini). The experiment was performed on 10 strains of each species, in three replications. Two types of microbiological media were used, i.e. standard and with an additional carbon source. Nickel was applied in the form of two compounds, NiCl2 center dot 6H(2)O and NiSO4 center dot 7H(2)O in the following doses (mg Ni center dot dm(-3) of the medium): 2, 4, 6, 8, 10, 100, 200, 300, 400. Laboratory studies revealed that the tested microorganisms showed various degrees of sensitivity to nickel introduced into the growth media. Among the bacteria analyzed, Azotobacter spp. was found to be most sensitive to nickel compounds, followed by Arthrobacter spp., Bradyrhizobium spp. (lupini) and Rhizobium leguminosarum bv. viciae, which was most nickel-resistant. NiCl2 center dot 6H(2)O was more toxic to Arthrobacter spp. and Rhizobium leguminosarum bv. viciae, while NiSO4 center dot 7H(2)O to Azotobacter spp. and Bradyrhizobium spp. (lupini).

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