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Related Concept Videos

Bacterial Phylum Cyanobacteria01:30

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Cyanobacteria are a diverse group of oxygenic, phototrophic bacteria that played a pivotal role in converting Earth’s atmosphere from anoxic to oxygen-rich billions of years ago. They exhibit remarkable morphological diversity, ranging from unicellular forms to filamentous types, with cell sizes varying between 0.5 μm and 100 μm. Cyanobacteria are classified into five groups: Chroococcales (unicellular, dividing by binary fission), Pleurocapsales (unicellular, dividing by...
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Inorganic Nitrogen Assimilation01:22

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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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Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...
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Microbial Interactions: Cooperation01:26

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Microbial cooperation involves beneficial interactions in which different species work together for individual or mutual advantage. These interactions can profoundly influence ecological dynamics and evolutionary processes, and they are essential to many pathogenic and symbiotic relationships.Nematode–Bacteria CooperationA striking example is the relationship between the Gram-negative bacterium Xenorhabdus nematophila and the parasitic nematode Steinernema carpocapsae. Juvenile nematodes...
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Microbial Interactions: Mutualism01:25

Microbial Interactions: Mutualism

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Mutualism is a symbiotic interaction in which all participating organisms benefit. These relationships can be obligate or facultative and are fundamental to ecosystem functions across diverse biological systems.Plant–Fungi MutualismOne well-known example is the association between plant roots and mycorrhizal fungi, such as Rhizophagus species. The fungal hyphae penetrate the root hairs and the epidermis, forming an extensive hyphal network that establishes a symbiotic association. Through...
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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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Cellular interactions: lessons from the nitrogen-fixing cyanobacteria.

Anne W Thompson1, Jonathan P Zehr1

  • 1Department of Ocean Sciences, University of California, 1156 High Street, Santa Cruz, California, 95064, USA.

Journal of Phycology
|March 24, 2016
PubMed
Summary
This summary is machine-generated.

Marine nitrogen-fixing cyanobacteria are more diverse and widespread than previously known. Understanding their varied cellular interactions is key to their role in ocean nutrient cycling and global carbon cycles.

Keywords:
Cyanobacteriaecologynitrogen fixationnitrogenasesymbioses

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Area of Science:

  • Marine microbiology
  • Biogeochemical cycles
  • Cyanobacterial ecology

Background:

  • Marine nitrogen-fixing cyanobacteria are crucial for open-ocean primary production, converting atmospheric dinitrogen (N2) gas into bioavailable nitrogen (N).
  • Historically, Trichodesmium was considered the dominant genus, but recent findings reveal greater diversity, including novel symbionts and wider geographic distribution.
  • This diversity presents new challenges for understanding their ecological roles and impact on global oceanic N cycling.

Purpose of the Study:

  • To review current knowledge on the cellular interactions of marine nitrogen-fixing cyanobacteria.
  • To highlight knowledge gaps and suggest future research directions.
  • To explore the ecological implications of cyanobacterial diversity for marine food webs and biogeochemical cycles.

Main Methods:

  • Literature review of studies on marine nitrogen-fixing cyanobacteria.
  • Analysis of research on cyanobacterial cellular interactions, including symbiosis and free-living states.
  • Synthesis of findings related to ecological roles, distribution, and biogeochemical contributions.

Main Results:

  • Marine nitrogen-fixing cyanobacteria exhibit a wide range of cellular interactions, from symbiotic integration to free-living existence.
  • The diversity of these cyanobacteria is greater than previously recognized, with implications for their ecological functions.
  • Understanding these interactions is essential for interpreting their distribution, abundance, and impact on nitrogen and carbon cycling.

Conclusions:

  • The diverse cellular interactions of marine nitrogen-fixing cyanobacteria are central to their ecological significance in the open ocean.
  • Future research should focus on the functional roles of these interactions in microbial communities and food webs.
  • A comprehensive understanding of cyanobacterial diversity and interactions will improve models of global oceanic N and C cycling.