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PRODUCTION OF MALE GAMETES AND AUXOSPORES IN THE CENTRIC DIATOMS CYCLOTELLA MENEGHINIANA AND C. CRYPTICA(1) (2).

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Wall ultrastructure of Scenedesmus culture N 46.

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SCENEDESMUS MORPHOGENESIS. TRACE ELEMENTS AND SPINE FORMATION(1).

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Summary
This summary is machine-generated.

Scenedesmus spines formation is dependent on nutrient concentration. Supplementing dilute media with iron (Fe EDTA) or calcium (Ca EDTA) induced spine development in this soil alga.

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Area of Science:

  • * Algology
  • * Phycology
  • * Microbiology

Background:

  • * The soil alga Scenedesmus exhibits diverse morphologies, including spine formation, which can vary with environmental conditions.
  • * Previous observations suggest that nutrient availability influences the growth and morphology of Scenedesmus species.

Purpose of the Study:

  • * To investigate the specific environmental factors, particularly nutrient composition, that regulate spine formation in Scenedesmus culture 16.
  • * To determine the role of individual medium components in inducing spine development.

Main Methods:

  • * Axenic culture of Scenedesmus culture 16 in a dilute laboratory medium (approx. 30 mg/liter total salts).
  • * Comparative analysis of colony morphology under different medium concentrations and supplementation with specific nutrients (Fe EDTA, Ca EDTA).
  • * Microscopic examination of cell arrangement, cell length, and chloroplast integrity.

Main Results:

  • * Spines were absent in dilute medium, resulting in a morphology resembling S. bijugatus.
  • * Spine formation was induced upon transfer to dilute medium supplemented with Fe EDTA or Ca EDTA, but not other individual components.
  • * Spineless colonies in dilute medium showed linear cell arrangement and shorter terminal cells, contrasting with the alternate arrangement and equal cell length in spiny colonies.

Conclusions:

  • * Nutrient availability, specifically iron and calcium, plays a critical role in triggering spine formation in Scenedesmus culture 16.
  • * Medium concentration and specific nutrient supplements significantly alter colony morphology and cell arrangement in Scenedesmus.
  • * The study elucidates the environmental control over morphological plasticity in soil algae.