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This article in AJ

  1. Vol. 58 No. 2, p. 223-224
    Received: Sept 24, 1965

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Effect of Soil Actinomycetes on Strains of Rhizobium japonicum1

  1. Salih M. Damirgi and
  2. Herbett W. Johnson2



Twenty-four isolates of Actinomycetes were taken from soil of an experimental soybean field. Susceptibility of eight Rhizobium japonicum strains to antimicrobial action of the Actinomycete isolates on yeast extractmannitol agar was tested. Twenty of the isolates produced no inhibition of rhizobia. Isolate E1 antagonized only R. japonicum strain 76 and isolate E8 was antagonistic to all strains. Two other isolates showed slight inhibition of strains 122 and 123.

Infectivity of rhizobia on soybean variety Kent was evaluated in the presence of selected Actinomycete isoiates. In autoclaved soil, reductions in nodule numbers produced by rhizobial strains were 35% and 53%, when Actinomycete E8 was introduced into the soil at the time of planting and 28 days before planting, respectively. Generally, similar results were obtained in sterilized sand jars.

The results suggest that anti-rhizobial soil microorganisms in a particular soil play a role in the establishment of specific rhizoblal strains.

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