期刊
PROTIST
卷 161, 期 2, 页码 177-196出版社
ELSEVIER GMBH
DOI: 10.1016/j.protis.2009.09.003
关键词
Apoikia; Bicosoecida; Chrysophyceae; Filos; Nanos; stramenopiles
类别
资金
- National Science Foundation [MCB-9977903]
- University of Wisconsin-Madison
- Tula Foundation (Centre for Microbial Diversity and Evolution)
- National Science and Engineering Research Council of Canada (NSERC) [283091-09]
- Canadian Institute for Advanced Research
Three heterotrophic stramenopiles-Apoikia lindahlii comb. nov. (Chrysophyceae), Filos agilis gen. et sp. nov. (Bicosoecida), and Nanos amicus gen. et sp. nov. (Bicosoecida)-were isolated from acidic peat bogs. The biflagellate A. lindahlii forms loose irregular colonies from which swimming cells may detach, and produces extensive mucilaginous material containing bacterial cells. Phylogenetic analyses of small subunit rDNA sequences demonstrated that A. lindahlii branches within the Chrysophyceae. While A. lindahlii is an obligate heterotroph, ultrastructural observations revealed a leukoplast in the perinuclear region. The pico-sized uniflagellates F. agilis and N. amicus were isolated from separate lakes and within the mucilage of A. lindahlii, suggesting their close associations in natural habitats. In SSU rDNA phylogenies, F. agilis and N. amicus were closely related to the bicosoecids Adriamonas, Siluania, Paramonas, and Nerada. While Filos, Nanos, and Siluania are similar in light microscopic features, their SSU rDNA gene sequences differed significantly (>8% differences) and were not monophyletic. Both F. agilis and N. amicus have a cytostome/cytopharynx particle ingestion apparatus. Bacterial cells and material similar to the mucilage of A. lindahlii occurred within the food vacuole of F. agilis and N. amicus. The nature of association between A. lindahlii and its epibiontic bicosoecids is discussed. (C) 2009 Elsevier GmbH. All rights reserved.
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