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Cable bacteria can significantly reduce methane emissions from rice fields. Inoculating soil with these microbes boosted sulfate levels, cutting greenhouse gas output by 93%.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Agricultural Science

Background:

  • Methane is a potent greenhouse gas, with rice fields contributing significantly to global emissions.
  • Sulfate amendment is a known strategy to mitigate methane release by competing with methanogens.
  • Cable bacteria are filamentous microbes capable of increasing environmental sulfate through electrogenic sulfide oxidation.

Purpose of the Study:

  • To investigate the efficacy of cable bacteria in reducing methane emissions from rice field soil.
  • To determine if cable bacteria can enhance sulfate levels and subsequently impact methane production.

Main Methods:

  • Rice-vegetated soil pots were inoculated with cable bacteria.
  • Sulfate levels in the soil were measured.
  • Methane emissions from the inoculated pots were compared to control pots without cable bacteria.

Main Results:

  • One-time inoculation with cable bacteria increased the soil sulfate inventory fivefold.
  • Methane emissions were reduced by 93% in pots with cable bacteria compared to controls.
  • This demonstrates a direct link between cable bacteria, increased sulfate, and reduced methane output.

Conclusions:

  • Cable bacteria show significant potential as a biological mitigation strategy for methane emissions in rice cultivation.
  • Promoting cable bacteria, through enrichment or management, could be a novel approach to reduce anthropogenic greenhouse gas contributions from agriculture.
  • Further research into practical application in field settings is warranted.