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Nitrogen-fixing cyanobacterium with a high phycoerythrin content.

H Rodriguez1, J Rivas, M G Guerrero

  • 1Instituto de Bioquímica Vegetal y Fotosíntesis, Facultad de Biología, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Apartado 1113, 41080 Seville, Spain.

Applied and Environmental Microbiology
|March 1, 1989
PubMed
Summary

This study investigates a unique nitrogen-fixing cyanobacterium strain with high C-phycoerythrin content, unusual for its N(2)-fixing ability. This Anabaena strain shows high productivity and rapid flocculation, making it promising for cultivation.

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Area of Science:

  • * Marine Microbiology and Phycology
  • * Biotechnology and Bioresource Utilization

Background:

  • * Cyanobacteria are crucial microorganisms with diverse metabolic capabilities.
  • * Nitrogen-fixing cyanobacteria play a vital role in aquatic ecosystems.
  • * Pigment composition in cyanobacteria influences light harvesting and adaptation.

Purpose of the Study:

  • * To characterize a novel phycoerythrin-rich, nitrogen-fixing Anabaena strain.
  • * To investigate the pigment composition, particularly C-phycoerythrin levels.
  • * To assess the strain's productivity and flocculation properties for potential applications.

Main Methods:

  • * Elemental and molecular composition analysis.
  • * Pigment content determination (chlorophyll a, carotene, phycobiliproteins).

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  • * Spectroscopic analysis (absorption and fluorescence) of phycobilisomes.
  • * Assessment of growth, productivity, and flocculation under varying conditions.

    • Main Results:

    • * The Anabaena strain possesses high C-phycoerythrin content (8.3% of dry weight), unusual for N(2)-fixing species.
    • * Pigment composition is influenced by irradiance and cell density, with C-phycoerythrin showing greater adaptation.
    • * The strain exhibits clumpy morphology and rapid flocculation, with outdoor productivities exceeding 20 g (dry weight)/m²/day in summer.

    Conclusions:

    • * This phycoerythrin-rich Anabaena strain represents a unique resource for N(2)-fixing cyanobacteria research.
    • * Its high C-phycoerythrin content and adaptive pigment changes offer insights into light harvesting strategies.
    • * The strain's rapid flocculation and high productivity suggest potential for large-scale cultivation and biotechnological applications.