Ernährungsphysiologisch-autökologische Untersuchungen an der planktischen BlaualgeOscillatoria rubescens DC.

The traditional cyanobacterial form-genus Aphanothece was established according to morphological criteria in the middle of the 19th century by Na¨geli. It comprises unicellular morphotypes with oval or cylindrical cells arranged irregularly in amorphous mucilaginous colonies. Up to now, more than 80 morphospecies have been described, mostly from various freshwater aquatic habitats. The genus Aphanothece is heterogeneous in the traditional morphological concept as well as according to modern molecular criteria. Therefore, it must be divided into several taxonomic clusters. Generic characteristics, studied by a combination of molecular sequencing of 16S rDNA, ultrastructure, ecology and morphological variation, were investigated in selected strains and populations of type species of the traditional subgenera Aphanothece and Anathece. Distinct differences were found between both of these clusters in their position in the phylogenetic tree, ultrastructure of cells, morphology (size of cells), mucilage structure, life cycles and ecology. They must therefore be separated into two genera, according to both bacteriological and botanical criteria, and placed in different orders (Chroococcales and Synechococcales). Accordingly we describe Anathece, gen. et stat. nov., and transfer to it the type A. clathrata comb. nov. and six other species. Several other morphotypes, originally classified in the genus Aphanothece (but morphologically different from Aphanothece sensu stricto), correspond to the genera Cyanoaggregatum, Cyanogastrum, Gloeobacter, Gloeothece and Halothece. The closest relative of Anathece appears to be Cyanobium.

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“…The strains studied (Table 2) were grown in two media -Z (Zehnder in Staub, 1961) and BG11 (Rippka et al, 1979) …”

Section: Culturesmentioning

confidence: 99%

Phylogenetic and taxonomic delimitation of the cyanobacterial genusAphanotheceand description ofAnathece gen. nov.

Komárek

Kaštovský

Jezberová

2011

European Journal of Phycology

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“…Strain CYA 1 (Staub, 1961 ;Utkilen et al, 1985) was obtained from the Culture Collection of the Norwegian Institute for Water Research (NIVA), Oslo. Further cultures were established from single filaments isolated from samples taken from Lake Zu$ rich in March, June, September and October 1997.…”

Section: Clonal Cultures Of Planktothrix Rubescens the Clonal Culturesmentioning

confidence: 99%

“…We are currently investigating the proportions of GV genotypes by collecting much larger samples of single filaments for genotype analysis using PCR. It is worth commenting, however, on the apparent disappearance of genotype GV1 : two out of the first 10 clonal cultures established in 1993 were GV1 whereas in the 1997 isolates only one out of 175 was of this genotype ; moreover, a culture of Planktothrix rubescens established from a Lake Zu$ rich water sample by Staub in 1958(Staub, 1961, and maintained for 40 years as strain CYA 1 in the NIVA collection, is also of genotype GV1.…”

Section: Frequency Of Different Gv Genotypes In Lake Zu $ Richmentioning

confidence: 99%

The diversity of gas vesicle genes in Planktothrix rubescens from Lake Zürich

et al. 1999

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) shows that strains of the GV3 genotype produce gas vesicles with a higher critical pressure than those of GV1 and GV2. A PCR survey of 185 clonal cultures of P. rubescens isolated from Lake Zu $ rich revealed that 3 isolates were of genotype GV1, 73 were of GV2 and 109 were of GV3. The PCR technique was used to distinguish the gas vesicle genotype, and thence the associated critical-pressure phenotype, of single filaments selected from lakewater samples. Sequence analysis of the 16S rDNA and of regions within the operons encoding phycoerythrin, phycocyanin and Rubisco confirmed that these strains of Planktothrix form a tight phylogenetic group.

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“…In this respect, Z-medium described by Staub (1961) and Allen's free nitrogen medium described by Hughes et al (1958) modified by Allen (1968), using the techniques described by Esmarch (1914) and EL-Ayouty and Ayyad (1972), were used for isolation and culturing of the cyanobacterial isolates.…”

Section: Collection Of Cyanobacterial Isolatesmentioning

confidence: 99%

Cyanobacterial extra-metabolites against some pathogenic bacteria

Ibraheem¹,

Al‐Othman²,

Abdel-Raouf³

2012

Afr. J. Microbiol. Res.

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Ten cyanobacterial species (Nostoc calcicola, Nostoc commune, Nostoc entophytum, Nostoc minutum, Nostoc palndosum, Nostoc passerianum, Nostoc punctiforme, Anabaena ambigua, Anabaena amomala, and Anabaena doliolum) were isolated from the mangrove region of Ras Mohammed (Sinai, Egypt), and were tested for their allelopathic activities including inhibitory and/or promoting effects against two Gram positive bacteria (Bacillus subtilis and Staphylococcus aureus) and two Gram negative bacteria (Escherichia coli and Pseudomonas aeruginosa). Data suggested two types of allelopathic effects: one type which always appeared in cyanobacterial medium as in the case with N. minutum (medium that inhibits the growth of all tested bacterial species). The other type is induced only when cyanobacteria are in contact with bacteria; this is the case when the growth of both B. subtilis and S. aureus were inhibited in co-culture with N. commune. On the other hand, promotion effects of bacterial growth were observed when grown in cyanobacterial metabolites in most of studied cyanobacterial species. The biological assays for aqueous and methanolic extracts of the two Nostoc species revealed that both extracts for each species were not toxic at concentrations of 0.52 and 0.59 g L -1 water extract for N. commune and N. minutum, respectively and 0.31 and 0.425 g L -1 for methanolic extract for N. commune and N. minutum, respectively. No mortality was observed in tested mice within 72 h.

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Ernährungsphysiologisch-autökologische Untersuchungen an der planktischen BlaualgeOscillatoria rubescens DC.

Cited by 153 publications

References 87 publications

Phylogenetic and taxonomic delimitation of the cyanobacterial genusAphanotheceand description ofAnathece gen. nov.

Phylogenetic and taxonomic delimitation of the cyanobacterial genusAphanotheceand description ofAnathece gen. nov.

The diversity of gas vesicle genes in Planktothrix rubescens from Lake Zürich

Cyanobacterial extra-metabolites against some pathogenic bacteria

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