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Related Experiment Videos

Nitrogen fixation by Spirillum sp. from rice roots.

D N Nayak, V R Rao

    Archives of Microbiology
    |December 15, 1977
    PubMed
    Summary

    Rice root bacteria, Spirillum sp., show higher nitrogen fixation efficiency when plants receive less combined nitrogen. This efficiency also changes with plant age, regardless of nitrogen levels.

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    Area of Science:

    • Agricultural Microbiology
    • Plant-Microbe Interactions
    • Nitrogen Cycling

    Background:

    • Nitrogen fixation is crucial for plant growth, especially in nitrogen-poor environments.
    • Spirillum species are known plant-associated bacteria with nitrogen-fixing capabilities.
    • Understanding factors influencing nitrogen fixation in rice is vital for sustainable agriculture.

    Purpose of the Study:

    • To investigate the nitrogen-fixing efficiency of Spirillum sp. isolated from rice roots.
    • To determine the effect of different combined nitrogen levels on Spirillum sp. nitrogen fixation.
    • To assess the influence of rice plant age on the nitrogen-fixing efficiency of associated Spirillum.

    Main Methods:

    • Isolation of Spirillum sp. from rice plant roots under varying nitrogen fertilization regimes.
    • Culturing of isolated Spirillum strains.
    • Measurement of nitrogenase activity to quantify nitrogen fixation efficiency.

    Main Results:

    • Spirillum sp. from rice roots exposed to low combined nitrogen (20-40 kg N/ha) exhibited higher nitrogen-fixing efficiency.
    • Spirillum sp. from rice roots exposed to higher combined nitrogen (60-100 kg N/ha) showed lower nitrogen-fixing efficiency.
    • Nitrogen-fixing efficiency of Spirillum spp. varied with rice plant age, independent of nitrogen dosage.

    Conclusions:

    • Low combined nitrogen levels in rice cultivation favor more efficient nitrogen-fixing Spirillum sp.
    • Plant age is a significant factor affecting the nitrogen-fixing potential of root-associated Spirillum.
    • These findings highlight the dynamic relationship between nitrogen availability, plant age, and microbial nitrogen fixation in rice

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