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Flagellar systems in the euglenoid flagellates.

M A Farmer1, R E Triemer

  • 1Department of Biological Sciences, Rutgers University, Piscataway, NJ 08855-1049.

Bio Systems
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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The euglenoid flagellar apparatus, featuring basal bodies and microtubular roots, shows significant variation. Its fine structure supports the theory that euglenoids evolved from bodonid ancestors.

Area of Science:

  • Protistology
  • Cell Biology
  • Evolutionary Biology

Background:

  • Euglenoids possess a complex flagellar apparatus essential for motility and feeding.
  • Previous studies have described various components of the euglenoid flagellar system, but evolutionary links remain debated.

Purpose of the Study:

  • To elucidate the detailed ultrastructure of the euglenoid flagellar apparatus.
  • To investigate the evolutionary relationship between euglenoids and other flagellate groups, particularly bodonids.

Main Methods:

  • Transmission electron microscopy (TEM) was used to examine the fine structure of the flagellar apparatus in various euglenoid species.
  • Comparative analysis of ultrastructural features, including basal bodies, microtubular roots, and associated structures, was performed.

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Main Results:

  • The euglenoid flagellar apparatus typically comprises two basal bodies, three primary microtubular roots, and a fourth microtubular band associated with the reservoir.
  • Variations in basal body number, flagellar length, and the presence of additional structures like rhizoplasts were observed across species.
  • A newly discovered cytoplasmic pocket, continuous with the ventral flagellar root microtubules, shows homology to the MTR/cytostome of bodonids.

Conclusions:

  • The detailed fine structure of the euglenoid flagellar apparatus, particularly the ventral root-cytoplasmic pocket complex, provides strong evidence for their descent from bodonid ancestors.
  • Ultrastructural and biochemical data collectively support the evolutionary origin of euglenoids from within the bodonid lineage.