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23 results for “Nostoc”
Microcystin production by Nostoc in Greenlandic lakes
<p>Benthic primary producers are recognized for their important role in contributing to ecosystem productivity and nutrient cycling in lake and stream ecosystems, particularly in polar environments. In Arctic lakes, benthic producers often comprise mats or colonies of cyanobacteria capable of producing cyanotoxins. However, the extent to which benthic communities contribute cyanotoxins in polar regions remains poorly described. We evaluated the potential for benthic colonies of the cyanobacterium <i>Nostoc pruniforme </i>from lakes in Kangerlussuaq, Greenland, to contribute microcystins (MCs) to lake water using three approaches. First, we dissected field-collected <i>Nostoc </i>colonies and measured MCs within multiple layers of fresh colony tissue. Second, we conducted a laboratory experiment to evaluate the temporal dynamics of MC release by incubated, intact colonies. Finally, we quantified whether MC concentrations in water and sediment samples in the field were higher in and above dense bands of benthic <i>Nostoc </i>as compared to bare sediment. Field-collected <i>Nostoc </i>colonies contained MCs throughout the colony tissue, suggesting that damage to colonies from grazers or physical disturbance could facilitate the release of toxins into the water. Undamaged <i>Nostoc </i>colonies incubated in high-nutrient conditions in the laboratory leaked MCs into the surrounding water at a steady mass-specific rate over the course of seven days. MC concentrations in water and sediment from two Greenlandic lakes were highly variable, but slightly higher in lake water immediately above dense bands of <i>Nostoc </i>than in water immediately above bare sediments, suggesting that benthic <i>Nostoc </i>colonies contribute cyanotoxins to lake water and that MCs vary at very fine, 1-2 m spatial scales. Benthic cyanobacteria may be important in releasing MCs into aquatic ecosystems, especially in systems where benthic producers dominate, such as polar environments.</p>
FIGURE 7 in A phylogenetically distant clade of Nostoc-like (Cyanobacteria) taxa with the description of Reofilinostoc matlalcueyense gen. et sp. nov. from an extreme environment
FIGURE 7. Secondary structure of Box-B helix (16S-23S ITS) of Reofilinostoc matlalcueyense, Desikacharya nostocoides, and Minunostoc cylindricum.
FIGURE 4 in A phylogenetically distant clade of Nostoc-like (Cyanobacteria) taxa with the description of Reofilinostoc matlalcueyense gen. et sp. nov. from an extreme environment
FIGURE 4. Bayesian Inference (BI) phylogeny of Nodulariaceae family based on 1284 nucleotide positions analyzed.
FIGURE 1 in A phylogenetically distant clade of Nostoc-like (Cyanobacteria) taxa with the description of Reofilinostoc matlalcueyense gen. et sp. nov. from an extreme environment
FIGURE 1. Study area: A) pine forest from Nevado de Toluca. B) stream from the melting snow. C) general aspect of growing upper andesite. D) mouse-ear-shaped brown colonies.
FIGURE 2 in A phylogenetically distant clade of Nostoc-like (Cyanobacteria) taxa with the description of Reofilinostoc matlalcueyense gen. et sp. nov. from an extreme environment
FIGURE 2. Micrographs of Reofilinostoc matlalcueyense F02 under the light microscopy (LM). (A–B) longitudinal section showing trichomes with intercalary heterocyte (arrow), and the thick yellow periderm (*), also perpendicular and coiled trichomes from field material. (C) Colonies wrapped by mucilaginous sheath. (D-E) trichomes simple with few cells vegetative, and with more than 20 cells long, respectively. (F) trichomes with terminal heterocyte (arrow). (G) Akinete. (H) unequal division of an akinete intro a two vegetative cell and subsequent division. (I) Coiled trichomes with sheath. (B–I) dyed with cresil blue. (C–I) material in culture BG11. Scale bars A= 0 70 μm, B= 30 μm, C= 10 μm, D–I= 5 μm.
FIGURE 6 in A phylogenetically distant clade of Nostoc-like (Cyanobacteria) taxa with the description of Reofilinostoc matlalcueyense gen. et sp. nov. from an extreme environment
FIGURE 6. Secondary structure of D1-D1' helix (16S-23S ITS) of Reofilinostoc matlalcueyense, Desikacharya nostocoides, and Minunostoc cylindricum.
FIGURE 8. Secondary structure V3 in A phylogenetically distant clade of Nostoc-like (Cyanobacteria) taxa with the description of Reofilinostoc matlalcueyense gen. et sp. nov. from an extreme environment
FIGURE 8. Secondary structure V3 helix (16S-23S ITS) of Reofilinostoc matlalcueyense, Desikacharya nostocoides, and Minunostoc cylindricum.
FIGURE 5 in A phylogenetically distant clade of Nostoc-like (Cyanobacteria) taxa with the description of Reofilinostoc matlalcueyense gen. et sp. nov. from an extreme environment
FIGURE 5. Maximum Likelihood (ML) phylogeny of Nodulariaceae and Nostocaceae, based on 1284 nucleotide positions analyzed.
FIGURE 3 in Polyphasic characterization of Nostoc commune (Cyanobacteria, Nostocaceae) isolated from rice growing agro-ecosystems of Dima Hasao district of Assam, North-East India
FIGURE 3. Phylogenetic analysis based on partial 16S rRNA gene sequences. Marked strains are the N. commune strains isolated from the selected agro-ecosystems(flat and terraced paddy fields).
FIGURE 2. Growth curve obtained for the strains. A in Polyphasic characterization of Nostoc commune (Cyanobacteria, Nostocaceae) isolated from rice growing agro-ecosystems of Dima Hasao district of Assam, North-East India
FIGURE 2. Growth curve obtained for the strains. A. Nostoc commune AUS-JR/DB/NT-003. B. Nostoc commune AUS-JR/DB/NT- 004.
FIGURE 1. Morphological variation within the N. commune strains. A, B in Polyphasic characterization of Nostoc commune (Cyanobacteria, Nostocaceae) isolated from rice growing agro-ecosystems of Dima Hasao district of Assam, North-East India
FIGURE 1. Morphological variation within the N. commune strains. A, B. Plate view and liquid culture of N. commune AUS-JR/DB/ NT-003. C, D. Plate view and liquid culture of N. commune AUS-JR/DB/NT-004. E. A single colony of N. commune AUS-JR/DB/NT- 003. F. A single colony of N. commune AUS-JR/DB/NT-004. G. Disintegration of the sheath. H. Individual trichomes. I. Aseriate filaments (h: heterocyst). J. Seriate filaments. K. Ensheathed coccoid cells. L. Old colonies with reduced trichome. Bar length = 50µm.
Microcystin production by Nostoc in Greenlandic lakes
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FIGURE 51. A–D Nostoc verrucosum. Scale bars A–B in Freshwater Cyanobacteria of North-Eastern Australia: 3. Nostocales
FIGURE 51. A–D Nostoc verrucosum. Scale bars A–B = 20 μm, C–D = 50 μm
Nitrogen-regulated antisense transcription in the adaptation to nitrogen deficiency in Nostoc sp. PCC 7120
GEO Series GSE212705. Nostoc sp. PCC 7120 = FACHB-418. 6 samples. Type: Expression profiling by high throughput sequencing.
Nitrogen-reponsive transcriptome of a mutant strain of Nostoc sp. PCC 7120 lacking nsiR3 (ΔnsiR3)
GEO Series GSE150191. Nostoc sp. PCC 7120 = FACHB-418. 4 samples. Type: Expression profiling by array.
Effect of deletion of all0854 on gene expression of Nostoc sp. PCC 7120
GEO Series GSE218875. Nostoc sp. PCC 7120 = FACHB-418. 6 samples. Type: Expression profiling by high throughput sequencing.
Time course of nitrogen-responsive transcriptomes in Nostoc sp. PCC7120
GEO Series GSE120377. Nostoc sp. PCC 7120 = FACHB-418. 20 samples. Type: Expression profiling by array.
Comparative transcriptomics of wild-type (Nostoc punctiforme ATCC 29133) and hmpD-deletion strains (UCD 543) of Nostoc punctiforme ATCC 29133
GEO Series GSE42859. Nostoc punctiforme PCC 73102. 42 samples. Type: Expression profiling by array.
Comparative transcriptomics of wild-type (UCD 153) and patN-deletion strains (UCD 524) of Nostoc punctiforme ATCC 29133
GEO Series GSE40250. Nostoc punctiforme PCC 73102. 48 samples. Type: Expression profiling by array.
FIGURE 3 in A phylogenetically distant clade of Nostoc-like (Cyanobacteria) taxa with the description of Reofilinostoc matlalcueyense gen. et sp. nov. from an extreme environment
FIGURE 3. Maximum Likelihood (ML) phylogeny of Nodulariaceae and Nostocaceae, based on 1071 nucleotide positions analyzed.
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