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Related Experiment Videos

Denitrification in Rhizobium.

R M Zablotowicz, D L Eskew, D D Focht

    Canadian Journal of Microbiology
    |June 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Rhizobium strains show varied nitrate reduction capabilities. Some strains perform denitrification or nitrate respiration, while others do not reduce nitrate under anoxic conditions.

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    Area of Science:

    • Microbiology
    • Environmental Science
    • Biochemistry

    Background:

    • Nitrate reduction is a key microbial process influencing nitrogen cycling.
    • Rhizobium species are important plant symbionts, but their metabolic diversity is not fully understood.
    • Anoxic conditions are prevalent in many soil and aquatic environments.

    Purpose of the Study:

    • To investigate the dissimilatory nitrate reduction pathways in various Rhizobium strains.
    • To characterize the diversity of nitrate respiration and denitrification among Rhizobium species.
    • To understand the variability in nitrous oxide (N2O) production and metabolism.

    Main Methods:

    • Culturing of 33 Rhizobium strains under anoxic conditions.
    • Analysis of nitrate reduction products, including nitrite (NO2-), nitrous oxide (N2O), and nitrogen gas (N2).

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  • Distinguishing between complete denitrification and nitrate respiration.

    • Main Results:

    • Three distinct patterns of nitrate reduction were observed: denitrification (to N2O and N2), nitrate respiration (to NO2-), and no reduction.
    • Rhizobium japonicum and cowpea miscellany strains exhibited all three patterns.
    • Rhizobium leguminosarum, R. phaseoli, and R. trifolii strains did not exhibit dissimilatory nitrate reduction.
    • Significant differences in N2O production and metabolism were noted among denitrifying strains.

    Conclusions:

    • Rhizobium species display diverse capabilities for dissimilatory nitrate reduction.
    • Specific Rhizobium groups, like R. leguminosarum, lack the capacity for nitrate respiration or denitrification.
    • Variations in N2O dynamics highlight complex regulatory mechanisms within denitrifying Rhizobium strains.