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- Title
ARE CYTOPLASMIC POCKETS (MTR/POCKET) PRESENT IN ALL PHOTOSYNTHETIC EUGLENOID GENERA?<sup>1</sup>.
- Authors
Shin, Woongghi; Brosnan, Stacy; Triemer, Richard E.
- Abstract
In 1985, the existence of a cytoplasmic pocket formed from the reservoir membrane in the photosynthetic euglenoid Colacium was described. A band of reinforcing microtubules (MTR) derived from the ventral flagellar root lined the pocket, and a dense fibrillar mesh was associated with the membrane. A comparison of bodonid cytostomes, colorless euglenoid cytostomes, and the reservoir pocket found in Colacium suggested that the three structures were homologous and that photosynthetic euglenoids arose from phagotrophic ancestors. MTR/pockets have since been reported in other photosynthetic euglenoids, including Euglena , Eutreptia , Eutreptiella , Cryptoglena , Tetreutreptia , and Phacus. We found MTR/pockets in three additional taxa, Lepocinclis, Trachelomonas , and Strombomonas , thereby demonstrating the presence of this complex in representatives of all the major photosynthetic genera. A comparison of the MTR/pocket complex across genera indicated a reduction in structural complexity that was consistent with recent phylogenetic schemes based on molecular characters. Three alternative hypotheses of the origin of MTR/pockets in phototrophic euglenoids are presented and discussed.
- Subjects
EUGLENOIDS; PHYLOGENY; ULTRASTRUCTURE (Biology)
- Publication
Journal of Phycology, 2002, Vol 38, Issue 4, p790
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1046/j.1529-8817.2002.01208.x