| Autor: |
Mark A. Farmer, Brian S. Leander |
| Rok vydání: |
2000 |
| Předmět: |
|
| Zdroj: |
European Journal of Protistology. 36:405-413 |
| ISSN: |
0932-4739 |
| DOI: |
10.1016/s0932-4739(00)80046-2 |
| Popis: |
Summary This is the first report of epibiotic bacteria on the cell surface of an uncultured, phototrophic euglenid from freshwater. The long, rod-shaped bacteria fit tightly within the minor grooves of Euglena helicoideus and appear to be in a permanent relationship with the euglenid. The minor grooves provide attachment sites that are stable during euglenoid movement, and the bacteria are optimally positioned to receive byproducts and secretions released through the articulation zones between strips. Novel character states associated with the pellicle of E. helicoideus include a permanent strip duplication event that gives rise to 80 strips around the cell periphery. Like in most phototrophic euglenids, these strips reduce exponentially across a single whorl of terminating strips near the canal opening. The pattern of strip reduction near the posterior end of the cell consists of five whorls of terminating strips. This pattern of strip reduction is “bilinear” and is described mathematically. The evolutionary origin of the bilinear pattern is discussed with respect to the exponential and linear patterns described previously. The novel states of the pellicle are expected to provide important evidence for inferring phylogenetic relationships within the Euglenida. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect