当前位置： SCI文献检索 > EUROPEAN JOURNAL OF PROTISTOLOGY期刊下所有文献 > Reconstruction of the feeding apparatus in Postgaardi mariagerensis provides evidence for character evolution within the Symbiontida (Euglenozoa).

Reconstruction of the feeding apparatus in Postgaardi mariagerensis provides evidence for character evolution within the Symbiontida (Euglenozoa).

Abstract：

:Microbial eukaryotes living in low oxygen environments often have novel physiological and morphological features that facilitate symbiotic relationships with bacteria and other means for acquiring nutrients. Comparative studies of these features provide evidence for phylogenetic relationships and evolutionary history. Postgaardi mariagerensis, for instance, is a euglenozoan that lives in low oxygen environments and is enveloped by episymbiotic bacteria. The general ultrastructure of P. mariagerensis was described more than a decade ago and no further studies have been carried out since, mainly because these cells are difficult to obtain. Postgaardi lacks the diagnostic features found in other major euglenozoan lineages (e.g., pellicle strips and kinetoplast-like mitochondrial inclusions) and no molecular data are available, so the phylogenetic position of this genus within the Euglenozoa remains unclear. We re-examined and reconstructed the ultrastructural organization of the feeding apparatus in Postgaardi by serial sectioning an existing block of resin-embedded cells. Postgaardi possesses distinctive finger-like projections within the feeding apparatus; this system has only been found in one other highly distinctive flagellate, namely the symbiontid Calkinsia. Detailed comparisons of the cytoskeleton in Postgaardi and in two symbiontids, Calkinsia and Bihospites, provided new evidence for phylogenetic relationships and character evolution in all three genera.

journal_name

Eur J Protistol

journal_title

European journal of protistology

authors

Yubuki N,Simpson AG,Leander BS

doi

10.1016/j.ejop.2012.07.001

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

32-9

issue

1

eissn

0932-4739

issn

1618-0429

pii

S0932-4739(12)00053-3

journal_volume

49

pub_type

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