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86 results for “Nostocales”
FIGURE 3. D1-D1 in Descriptions of Brasilonema geniculatum and Calothrix dumus (Nostocales, Cyanobacteria): two new taxa isolated from cemetery tombstones
FIGURE 3. D1-D1' helices for B. geniculatum and closet relatives for which ITS sequence data is available a) B. geniculatum HWSC4C Clone IIA, b) B. geniculatum HWSC4C Clone IIB, c) B. lichenoides clone 5A, d) B. sp. RKST-3291 clone MB, e) B. sp. RKST-322 clone C1, f) B. sp. RKST-322 clone c2, g) B. octogenarum HA4186-MV1 clone b7a+p4, h) B. angustatum HA4187-MV1 clone b2+p1f, i) B. angustatum HA4187-MV1 clone b2+p1h.
FIGURE 7. Box B helices for C in Descriptions of Brasilonema geniculatum and Calothrix dumus (Nostocales, Cyanobacteria): two new taxa isolated from cemetery tombstones
FIGURE 7. Box B helices for C. dumus and closet relatives for which ITS sequence data is available. a) C. dumus HWSC1B clone A, b) C. dumus HWSC1B clone B, c) C. sp. SEV5-4-c5 clone operon 1, d) C. sp. SEV5-4-c5 clone operon II, e) C. sp. HA4395-MV3 clone B3- 4+P5e, f) C. sp. HA4283-MV5 clone p11B, g) C. sp. HA4283-MV5 clone p11D, h) C. sp. HA4283-MV5 clone p11A, i) C. sp. HA4186- MV5 clone B2+P10ab.
FIGURE 2 in Descriptions of Brasilonema geniculatum and Calothrix dumus (Nostocales, Cyanobacteria): two new taxa isolated from cemetery tombstones
FIGURE 2. Maximum likelihood tree of C. dumus and the closest relatives based on 16S rRNA gene sequences. Numbers above the line represent ML values, numbers below MP.
FIGURE 6. D1-D1 in Descriptions of Brasilonema geniculatum and Calothrix dumus (Nostocales, Cyanobacteria): two new taxa isolated from cemetery tombstones
FIGURE 6. D1-D1' helices for C. dumus and closet relatives for which ITS sequence data is available. a) C. dumus HWSC1B clone A, b) C. dumus HWSC1B clone B, c) C. sp. SEV5-4-c5 clone operon 1, d) C. sp. SEV5-4-c5 clone operon II, e) C. sp. HA4395-MV3 clone B3-4+P5e, f) C. sp. HA4283-MV5 clone p11B, g) C. sp. HA4283-MV5 clone p11D, h) C. sp. HA4283-MV5 clone p11A, i) C. sp. HA4186-MV5 clone B2+P10ab.
FIGURE 4. Box B helices for B in Descriptions of Brasilonema geniculatum and Calothrix dumus (Nostocales, Cyanobacteria): two new taxa isolated from cemetery tombstones
FIGURE 4. Box B helices for B. geniculatum and closet relatives for which ITS sequence data is available a) B. geniculatum HWSC4C Clone IIA, b) B. geniculatum HWSC4C Clone IIB, c) B. lichenoides clone 5A, d) B. sp. RKST-3291 clone MB, e) B. sp. RKST-322 clone C1, f) B. sp. RKST-322 clone c2, g) B. octogenarum HA4186-MV1 clone b7a+p4, h) B. angustatum HA4187-MV1 clone b2+p1f, i) B. angustatum HA4187-MV1 clone b2+p1h.
FIGURE 8. V3 helices for C in Descriptions of Brasilonema geniculatum and Calothrix dumus (Nostocales, Cyanobacteria): two new taxa isolated from cemetery tombstones
FIGURE 8. V3 helices for C. dumus and closet relatives for which ITS sequence data is available. a) C. dumus HWSC1B clone A, b) C. dumus HWSC1B clone B, c) C. sp. SEV5-4-c5 clone operon 1, d) C. sp. SEV5-4-c5 clone operon II, e) C. sp. HA4395-MV3 clone B3- 4+P5e, f) C. sp. HA4283-MV5 clone p11B, g) C. sp. HA4283-MV5 clone p11D, h) C. sp. HA4283-MV5 clone p11A, i) C. sp. HA4186- MV5 clone B2+P10ab.
FIGURE 1 in Descriptions of Brasilonema geniculatum and Calothrix dumus (Nostocales, Cyanobacteria): two new taxa isolated from cemetery tombstones
FIGURE 1. Maximum likelihood tree of B. geniculatum and the closest relatives based on 16S rRNA gene sequences. Numbers above the line represent ML values, numbers below MP.
FIGURE 5. V3 helices for B in Descriptions of Brasilonema geniculatum and Calothrix dumus (Nostocales, Cyanobacteria): two new taxa isolated from cemetery tombstones
FIGURE 5. V3 helices for B. geniculatum and closet relatives for which ITS sequence data is available. a) B. geniculatum HWSC4C Clone IIA, b) B. geniculatum HWSC4C Clone IIB, c) B. geniculatum HWSC4C Clone IIB second helix, d) B. geniculatum HWSC4C Clone IIB third helix, e) B. lichenoides clone 5A, f) B. sp. RKST-3291 clone MB, g) B. sp. RKST-322 clone C1, h) B. sp. RKST-322 clone c2, i) B. octogenarum HA4186-MV1 clone b7a+p4, j) B. angustatum HA4187-MV1 clone b2+p1f, k) B. angustatum HA4187-MV1 clone b2+p1h.
FIGURE 3 in Calochaete gen. nov. (Cyanobacteria, Nostocales), a new cyanobacterial type from the "páramo" zone in Costa Rica
FIGURE 3. Secondary structures of the D1- D1'(row one) and Box-B helices (row two) of strain CCALA 1012 and related strains of types similar either morphologically (Calothrix) or molecularly (members of Microchaetaceae—Tolypothrix and Spirirestis). A, E. Calochaete cimrmanii CCALA 1012. B, F. Tolypothrix sp. PCC 7504. C, G. Spirirestis rafaelensis WJT-71-NPBG6. D, H. Calothrix sp. PCC 7507.
FIGURE 2 in Calochaete gen. nov. (Cyanobacteria, Nostocales), a new cyanobacterial type from the "páramo" zone in Costa Rica
FIGURE 2. Phylogenetic analysis based on 16S rDNA sequence with 70 OTUs, using neigbor-joining topology. The support values are given for Neighbor-joining, Maximum likelihood, and Bayesian posterior probabilities. The cut-off values for bootstrap and probability are 50 (0.5 resp). Our reference strain CCALA 1012 (accession number HF912386) is printed in bold. Clusters A and B represent clades with members of the Microchaetaceae family demonstrating heterogeneity of the genus Tolypothrix and the whole family Microchaetaceae.
FIGURE 1 in Calochaete gen. nov. (Cyanobacteria, Nostocales), a new cyanobacterial type from the "páramo" zone in Costa Rica
FIGURE 1. Morphological variability of the strain CCALA 1012. A. Mature heteropolar filaments. B. detail of well-developed filament with terminal heterocyte. C. A filament germinating from hormogonium with enlarged cells. D, E. Formation of a hormogonium in a filament and hormogonia with enlarging cells. F. Middle part of a mature filament with thin colorless sheath. G. Double branching. H. Single branching. I. Young filament with distinct tapering. J. Swollen bases of mature filaments. K. Shape of the terminal cells. L, M. Enlarged cells in hormogonia dividing in two planes (marked with arrowheads). N. Young growing thallus with single branching. O. Hormogonia and their development after release from mother sheath. M. Well-developed filaments. Bar length = 20 µm.
FIGURE 3 in Morphological and Molecular Characterization of Brasilonema roberti-lamii (Cyanophyceae, Nostocales, Scytonemataceae), from Central Mexico
FIGURE 3. Maximum Likelihood tree based on sequences of the cpcBA-IGS gene. The analysis showed the relationships among Brasilonema species and Cyanobacteria of the same order (Nostocales), using Gloeobacter violaceus as the external functional group. Bootstrap values at supported nodes (> 50%) are given for Maximum Likelihood, and Maximum Parsimony values only in the cluster with Brasilonema.
FIGURE 2 in Morphological and Molecular Characterization of Brasilonema roberti-lamii (Cyanophyceae, Nostocales, Scytonemataceae), from Central Mexico
FIGURE 2. Maximum Likelihood tree based on sequences of the 16S rRNA gene. The phylogenetic analysis showed the relationships between Brasilonema species and Cyanobacteria of the same order (Nostocales), using Gloeobacter violaceus as the external functional group. Bootstrap values at supported nodes (> 50%) are given for Maximum Likelihood, and Maximum Parsimony values only in the cluster with Brasilonema.
FIGURE 1. Brasilonema roberti-lamii. A in Morphological and Molecular Characterization of Brasilonema roberti-lamii (Cyanophyceae, Nostocales, Scytonemataceae), from Central Mexico
FIGURE 1. Brasilonema roberti-lamii. A. According to Bourrelly and Manguin (1952). B–L. Brasilonema roberti-lamii from Los Manantiales. B–D. Habit. E. Detail of filament organization in fascicles. F–H. typical "C" or "J" shape of young trichomes with heterocytes. I, K, L. Different stages of hormogonia development. Arrow: proheterocyte. J. Parallel organization of filaments. Scale bars: C = 0.5 mm, D = 50 µm, E–J, L = 20 µm, K = 7 µm.
FIGURE 5 in Pseudoaliinostoc sejongens gen. & sp. nov. (Nostocales, Cyanobacteria) from floodplain soil of the Geum River in Korea based on polyphasic approach
FIGURE 5. Nucleotide divergences of the cyanobacteria 16S rRNA gene sequences (datasets used in Table 2) based on corrected pairwise genetic distance (p-distance), including Pseudoaliinostoc. Genetic distances between each paired sequence were calculated by Kimura 2-parameter model, where a total of 30 cyanobacteria species (30 sequences) were compared. Bar heights indicate % p-distance measured for intra-genera [e.g., Pseudoaliinostoc (Ps), Aliinostoc (Al), 5 genera of Aliinostoc relatives, including Anabaenopsis (An), Cyanospira (Cy), Halotia (Ha), Kryptousia (Kr), and Nodularia (No)] and inter-genera [e.g., PA vs. Al and between sister genera, including Kr vs. Tolypothrix (To), Ha vs. To, Kr vs. Ha, Cy vs. No, Cy vs. No, No vs. An, and Cy vs. An]. The values are shown as mean ±SD (Standard Deviation). Statistical analysis showed that the 16S rRNA gene divergence were significantly higher in Ps vs. Al than that calculated between tested sister genera (t-test, ** P <0.01, N = 26).
FIGURE 4. Secondary structures for the D1–D1 in Pseudoaliinostoc sejongens gen. & sp. nov. (Nostocales, Cyanobacteria) from floodplain soil of the Geum River in Korea based on polyphasic approach
FIGURE 4. Secondary structures for the D1–D1ʹ and Box-B in conserved regions of the 16S–23S ITS. (A, H) Aliinostoc morphoplasticum; (B, I) A. magnakinetifex; (C, J) A. catenatum; (D) Pseudoaliinostoc soli; (E) P. tiwarii; (F, K) P. constrictum; (G, L) P. sejongens.
FIGURE 3 in Pseudoaliinostoc sejongens gen. & sp. nov. (Nostocales, Cyanobacteria) from floodplain soil of the Geum River in Korea based on polyphasic approach
FIGURE 3. Alignment of the 16S–23S rRNA internal transcribed spacer (ITS) region from Nostoc sp., Aliinostoc morphoplasticum, and Pseudoaliinostoc sejongens. Different conserved domains (D1–D5), tRNA genes, major variable stems V2 and V3, and antiterminator (Box- B and Box-A) are indicated by boxes and names. Nostoc and P. sejongens contain both tRNAIle and tRNAAla, whereas A. morphoplasticum does not have tRNAIle. All compared sequences contain important structural elements of the ITS as described by Boyer et al. (2001).
FIGURE 1 in Pseudoaliinostoc sejongens gen. & sp. nov. (Nostocales, Cyanobacteria) from floodplain soil of the Geum River in Korea based on polyphasic approach
FIGURE 1. Microscopic photographs of Pseudoaliinostoc sejongens. (A) Amorphous mucilage (am) at the colony edge; (B, C) Arrangement of trichomes in the colony; (D, E) Hormogonia; (F, G) Barrel-shaped of vegetative cells and rounded apical cell; (H, I) Rounded conical apical cell; (J) Firm trichome with partially visible firm sheath (sh); (K) Hyaline sheaths (Chinese ink); (L) Thin and hyaline sheaths (Chinese ink); (M–O) Variable size of intercalary heterocytes (ih); (P, Q) Akinetes (ak); (R) Spherical intercalary heterocyte and subelliptical terminal heterocyte (th); (S) Akinete and heterocyte in trichomes. Scale bars, 50 μm (A); 20 μm (B); 10 μm (C–S).
Supplemental 3D Model Data - Hapalosiphonacean cyanobacteria (Nostocales) thrived amid emerging embryophytes in a 407-million-year-old landscape
<p>Three-dimensional reconstruction models of cyanobacteria from a 407 million year old fossil from the Lower Devonian Rhynie chert, UK. Thin sections SU.PB. 2023.0.1.2.8 from the Palaeobotany Collection in the Pôle Collections scientifiques et patrimoniales. Bibliothèque de Sorbonne Université, Paris (France).</p> <p>Imaris files (.IMS) can be viewed using the Imaris Viewer software, freely available in both Windows and Mac versions from https://imaris.oxinst.com/imaris-viewer. </p>
FIGURE 1 in True branching and phenotypic plasticity in the planktonic cyanobacterium Dolichospermum brachiatum sp. nov. (Nostocales, Aphanizomenonaceae), from south-eastern Australia
FIGURE 1. Morphology of Dolichospermum brachiatum from Waranga Basin. Scale bars = 20 μm.
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