Bacteria in the genus *Rhizobium* are nitrogen-fixing prokaryotes that establish symbiotic associations with legume plants like clover, alfalfa, and peas.

Rhizobium

Nitrogen fixation is the conversion of atmospheric nitrogen into ammonia, a nitrogenous compound that plants can use to synthesize essential biomolecules.

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Prokaryotes are vital to shaping and sustaining the global biosphere. Some prokaryotic species generate substantial amounts of oxygen, others convert atmospheric nitrogen into usable forms for plants and animals, and some reside in the human body where they produce essential substances and protect against pathogens.

Ecological Roles of Prokaryotes

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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Prokaryotes are vital to soil formation and stabilization. They decompose organic matter and form biofilms. In the rhizosphere, soil bacteria metabolize organic substances secreted by plant roots (such as acids and carbohydrates) and return the metabolic byproducts to the soil, forming nutrient-rich humus that increases soil fertility.

Role of Prokaryotes in Soil Fertility

Soil ecosystems host an immense concentration of microscopic life. A single gram of soil can contain up to 10 billion microorganisms, most of which are prokaryotes, representing approximately 1,000 different species.

Abundance and Diversity of Soil Microorganisms

Nitrogen Fixation

Bioremediation is the process of using microbial metabolism to degrade or remove toxic chemicals and pollutants from contaminated environments, such as water and soil.

Bioremediation

Prokaryotes act as key players in climate change when rising polar temperatures cause permafrost to thaw. As the frozen soil melts, prokaryotes metabolize the trapped carbon, releasing massive amounts of carbon dioxide and methane into the atmosphere and contributing to the greenhouse effect.

Role of Prokaryotes in Climate Change

Carbon fixation is the biological process by which microorganisms capture and convert inorganic carbon sources, such as carbon dioxide, into organic compounds.

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