• In vitro andin vivo nitrogenase activity ofRhizobium mutants and their symbiotic effectivity

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      https://www.ias.ac.in/article/fulltext/jbsc/003/02/0117-0123

    • Keywords

       

      Nitrogenase activity; symbiotic effectivity; inoculation; mutant strains; nodulation; nitrogen fixation

    • Abstract

       

      A slow growing nitrogen-fixing strain ofVigna radiata var.aureus (mung bean)Rhizobium which expressed nitrogenase activity in a synthetic medium was isolated from its native population. Mutants with decreased and increased nitrogenase activity were derived from this strain by treatment with acridine orange and ethidium bromide. These mutants were tested for symbiotic effectivity invivo. The effectivity of mutants with decreased nitrogenase activity in the culture medium was lower than the parent strain; however, the effectivity of mutants with higher nitrogenase activity did not increase above that of the parent. This suggests that the plant is perhaps a limiting factor in the full expression of rhizobial nitrogenase in the nodules.

    • Author Affiliations

       

      K R Dadarwal1 B S Kundu1 P Tauro1

      1. Department of Microbiology, Haryana Agricultural University, Hissar - 125 004
    • Dates

       
  • Journal of Biosciences | News

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