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The Nitrogen Cycle01:49

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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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Overview of Nitrogen Metabolism01:20

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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The Roles of Bacteria and Fungi in Plant Nutrition02:11

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Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
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Microorganisms play a crucial role in agriculture and the food industry, contributing to soil fertility, crop protection, and food production. Their functions range from nitrogen fixation and biopesticide production to fermentation and food preservation, making them indispensable to sustainable farming and food safety.Role in AgricultureNitrogen-fixing bacteria, such as Rhizobium (symbiotic) and Azotobacter (free-living), convert atmospheric nitrogen into ammonia through biological nitrogen...
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Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis
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Micromanaging the nitrogen cycle in agroecosystems.

Isaac M Klimasmith1, Angela D Kent1

  • 1Natural Resources and Environmental Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA.

Trends in Microbiology
|May 26, 2022
PubMed
Summary
This summary is machine-generated.

Microbial inoculants offer sustainable nitrogen for agriculture, but their full ecosystem impact, including effects beyond nitrogen fixation, requires further study. This review explores their potential in nutrient management.

Keywords:
agricultural sustainabilitybiostimulantmicrobial inoculantnitrogen

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Area of Science:

  • Agricultural Science
  • Environmental Microbiology
  • Soil Science

Background:

  • Synthetic nitrogen fertilizers boost crop yields but cause environmental damage through nitrate and nitrous oxide (N2O) pollution.
  • Nitrogen losses from agroecosystems contaminate water and contribute to climate change.
  • Growing interest exists in nitrogen-fixing microorganisms as a sustainable alternative to synthetic fertilizers.

Purpose of the Study:

  • To review recent research on microbial inoculants for nutrient management.
  • To assess the broader impacts of microbial inoculants on nitrogen dynamics in ecosystems.
  • To understand the potential of inoculants beyond nitrogen fixation.

Main Methods:

  • Literature review of recent studies on microbial inoculants.
  • Synthesis of research on nutrient management strategies.
  • Analysis of nitrogen transformations influenced by microbial inoculants.

Main Results:

  • Microbial inoculants show promise for sustainable nitrogen supply.
  • The ecosystem-level impacts of inoculants on nitrogen dynamics are not fully understood.
  • Inoculants may influence nitrogen transformations beyond their primary fixation role.

Conclusions:

  • Microbial inoculants are a key area for sustainable agriculture and nutrient management.
  • Further research is needed to fully elucidate the ecosystem-level effects of inoculants.
  • Understanding the full scope of inoculant impacts, including nitrogen transformations, is crucial.