Article (Scientific journals)
Ultrastructure and taxonomic position of two species of the cyanobacterial genus Schizothrix
Komarek, J.; Taton, A.; Sulek, J. et al.
2006In Cryptogamie Algologie, 27 (1), p. 53-62
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Keywords :
conservation; cyanobacteria; cyanoprokaryotes; Schizothrix; ultrastructure; taxonomy
Abstract :
[en] The cyanobacterial genus Schizothrix is traditionally classified in the special family Schizotrichaceae (order Oscillatoriales) according to the structure of the filaments and thallus: one, two, or more ensheathed and fasciculated trichomes are enveloped by common sheaths. The fine Structure of cells and filaments of two natural populations of typical Schizothrix-species (S. facilis, S lacustris) were investigated in our Study. The ultrastructure of trichomes was found to be similar to the pseudartabaenacean types (thylakoid arrangement, inclusions, cell wall), and indicates the close relationship to this group of simple filamentous cyanobacteria. The special life form, which was considered as the most important phenotypic intergeneric (and interfamilial) differentiating character was proven: Fasciculated trichomes are enveloped by their own sheaths, and form (usually heteropolar) filaments enveloped by mother common sheath. However, in spite of the fact that the ultrastructure and morphology of trichomes were found to be similar to other pseudanabacnacean types, the relationship to Pseudanabaenaceae must await detailed molecular studies to be more completely evaluated. The first molecular results concerning a few Schizothrix-like strains from Antarctica show that most belong to a cluster, which is separated from the other oscillatorian clusters. This could support the genetic basis of the Schizothrix genus.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Aquatic sciences & oceanology
Author, co-author :
Komarek, J.
Taton, A.
Sulek, J.
Wilmotte, Annick  ;  Université de Liège - ULiège > Département des sciences de la vie > Enzymologie
Kastovska, K.
Elster, J.
Language :
English
Title :
Ultrastructure and taxonomic position of two species of the cyanobacterial genus Schizothrix
Publication date :
February 2006
Journal title :
Cryptogamie Algologie
ISSN :
0181-1568
Publisher :
Adac-Cryptogamie, Paris, France
Volume :
27
Issue :
1
Pages :
53-62
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
MICROMAT
Funders :
UE - Union Européenne [BE]
Available on ORBi :
since 11 February 2010

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