Article (Scientific journals)
Remarkable conservation of internally transcribed spacer sequences of Arthrospira ("Spirulina") (Cyanophyceae, Cyanobacteria) strains from four continents and of recent and 30-year-old dried samples from Africa
Baurain, Denis; Renquin, Laurent; Grubisic, Stana et al.
2002In Journal of Phycology, 38 (2), p. 384-393
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Keywords :
Arthrospira; "dihe"; evolution; ITS; molecular taxonomy; rRNA; sequences; Spirulina
Abstract :
[en] The internally transcribed spacer (ITS) sequences of 21 Arthrospira clonal strains from four continents and assigned to four different species (A. platensis, A. maxima, A. fusiformis, A. indica) in the culture collections were determined. Two main clusters, I and H, were differentiated by 49 positions out of 475 nt or 477 nt, respectively. Each cluster was further subdivided into two subclusters. Subclusters LA and I.B were separated by two substitutions, whereas subclusters II.A, and II.B were distinguished by four substitutions. After direct sequencing of the PCR products, three dried samples from Chad aged between 3 months and 35 years yielded a sequence belonging to subcluster I.A, as did a recent commercial product. The strains grown in production plants belonged to the same (sub)clusters as strains from culture collections, mainly LA and II. PCR primers specific for each cluster and subcluster were designed and tested with crude cell lysates of Arthrospira strains. One dried sample ("dihe' 1) and a herbarium sample from Lake Sonachi (Kenya) only contained I.A sequences, whereas the commercial product was a mixture of the four genotypes and the other two dried samples contained minor polymorphisms characteristic of different clusters. Five clonal Arthrospira strains, thought to be duplicates, showed the simultaneous presence of the two :Forms of the four diagnostic positions that distinguish subclusters genotype H.A and genotype II.B. This is likely to be caused by multiple copies of the rDNA operon, in a intermediate stage of homogenization between subcluster II.A and subcluster II.B. The high conservation of ITS sequences is in contrast with the assignment to four different species, the great morphological variability of the strains, and their wide geographic distribution.
Disciplines :
Aquatic sciences & oceanology
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Baurain, Denis  ;  Université de Liège - ULiège > Département de Botanique
Renquin, Laurent;  Université de Liège - ULiège > Département de Botanique
Grubisic, Stana ;  Université de Liège - ULiège > Département de Botanique
Scheldeman, Patsy;  Université de Liège - ULiège > Département de Botanique
Belay, Amha;  Earthrise Nutritionals, Inc.
Wilmotte, Annick  ;  Université de Liège - ULiège > Département de Botanique
Language :
English
Title :
Remarkable conservation of internally transcribed spacer sequences of Arthrospira ("Spirulina") (Cyanophyceae, Cyanobacteria) strains from four continents and of recent and 30-year-old dried samples from Africa
Publication date :
April 2002
Journal title :
Journal of Phycology
ISSN :
0022-3646
eISSN :
1529-8817
Publisher :
Blackwell Publishing Inc, Malden, United States - Massachusetts
Volume :
38
Issue :
2
Pages :
384-393
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Molecular diversity of the Arthrospira genus
Funders :
Earthrise Farms, Calipatria, California, USA
Available on ORBi :
since 10 August 2009

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