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Isolation, Propagation, and Identification of Bacterial Species with Hydrocarbon Metabolizing Properties from Aquatic Habitats
Published on: December 7, 2021
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Expanding the Eco-collection of Methane-oxidizing Bacteria Inhabiting Rice Roots: Cultivation, Isolation, and Genomic
Fumika Oe1, Rina Shinjo1, Sachiko Masuda2
1Graduate School of Bioagricultural Sciences, Nagoya University.
Microbes and Environments
|October 13, 2025
Summary
Methane-oxidizing bacteria (MOB) in rice roots were isolated and characterized. This study expands our understanding of MOB in flooded rice fields, crucial for mitigating methane emissions.
Area of Science:
- Environmental Microbiology
- Agricultural Science
- Biogeochemistry
Background:
- Flooded rice fields are significant sources of atmospheric methane (CH4), a potent greenhouse gas.
- Rice roots are key sites for methane oxidation, yet the characteristics of methane-oxidizing bacteria (MOB) there are poorly understood.
Purpose of the Study:
- To isolate and characterize methane-oxidizing bacteria (MOB) from rice roots.
- To investigate the physiological and genomic diversity of MOB in flooded rice ecosystems.
Main Methods:
- Isolation of MOB from three rice cultivars (Oryza sativa L. subsp. japonica, O. sativa L. subsp. indica, and Tupa 121-3).
- Phenotypic characterization including morphology and colony formation.
- Genomic analysis via whole-genome sequencing.
Main Results:
- Twelve MOB isolates were purified: two Methylomonas sp., three Methylocystis sp., and seven Methylosinus sp.
- Significant variations observed in methane monooxygenase, methanol dehydrogenase, and nitrogenase gene clusters.
- Four strains showed characteristics of potentially novel species within Methylomonas or Methylocystis genera.
Conclusions:
- This research expands the collection of characterized MOB from rice roots.
- The findings provide insights into the diversity and genetic makeup of MOB, contributing to understanding methane cycling in rice fields.
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