Interaction of cultural conditions of streptomyces species, with or without their metabolites, on growth and nodulation of soybean plant

ABSTRACT

In pot experiments, the effect of treatment with plain medium of Streptomyces, containing various nitrogen sources, revealed a significant increase in fresh and dry weight of the leaves, stem and roots of soybean plants, in absence or presence of Rhizobium japonicum. The results showed more elevation due to treatment with the culture filtrates of either Streptomyces violo-chromogenes or Streptomyces glaucescens, in absence or presence of Rhizobium except treatment with culture filtrate of S. glaucescens on medium IV, in presence of Rhizobium, which induced a slight suppression in fresh and dry weight of the leaves, stem and root. In most cases, addition of culture filtrate of either organisms, growth on the test media caused an increase in number, total fresh and dry weight of root nodules of soybean plants