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211 results for “Chlorophyta”
Brilliantia kiribatiensis, a new genus and species of Cladophorales (Chlorophyta) from the remote coral reefs of the Southern Line Islands, Pacific Ocean
<p>Data associated with the study "<em>Brilliantia kiribatiensis</em>, a new genus and species of Cladophorales (Chlorophyta) from the remote coral reefs of the Southern Line Islands, Pacific Ocean".</p> <p><strong>ITS.fasta, ITS_bmge.fasta, LSU.fasta, LSU_bmge.fasta, SSU.fasta, SSU_bmge.fasta: </strong>SSU rDNA, LSU rDNA and rDNA ITS sequences used in phylogenetic analyses. Sequences of Brilliantia kiribatiensis were added to updated phylogenetic datasets used previously (Leliaert et al. 2007a, Leliaert et al. 2009b), aligned in MAFFT v7.215 (Katoh and Standley 2013), and stripped of hypervariable sites in BMGE v1.1 (Criscuolo and Gribaldo 2010) by using the -h 0.4 -g 0.35 parameters. Alignments were visually checked and concatenated in Seaview v4.4.2.</p> <p><strong>concatenated_SSU_ITS_LSU.fasta</strong>: concatenated alignment with following partitions: SSU: 1-1797, ITS1+5.8S+ITS2: 1798-3335, LSU: 3336-3926.</p> <p><strong>Table_S1_sequence_sources.xls: </strong>GenBank accessions, sample isolate codes and sites of collection for sequences included in the concatenated phylogenetic data set.</p> <p><strong>Table S2. </strong>Percent cover of different algal groups in 1 m2 photoquadrats. Algal groups are identified to genus level for fleshy macroalgae or functional group for turf algae, branched red algae, crustose coralline algae, and cyanobacteria.</p> <p><strong>Table SX.</strong> Morphological measurements of <em>Brilliantia kiribatiensis</em>.</p>
FIG. 2 in Molecular data and culture observations show that the microfilamentous marine alga Uronema marinum Womersley is a member of the genus Okellya Leliaert & Rueness (Cladophorales, Chlorophyta)
FIG. 2. — Maximum likelihood phylogenetic tree of selected Cladophorales Haeckel, showing the position of the species Okellya marina (Womersley) Wetherbee, comb. nov. as sister to Okellya curvata (Printz) Leliaert & Rueness in the Okellyaceae Leliaert & Rueness family. Numbers shown at nodes represent RAxML rapid bootstrap values. The scale is in estimated substitutions per site in the concatenated 18S and 28S alignment.
FIG. 1 in Molecular data and culture observations show that the microfilamentous marine alga Uronema marinum Womersley is a member of the genus Okellya Leliaert & Rueness (Cladophorales, Chlorophyta)
FIG. 1. — Okellya marina (Womersley) Wetherbee, comb. nov. (strain 56a) from New South Wales: A, tuft of filaments; B, C, newly formed filaments of two and four cells attached by a discoid holdfast (asterisks), apical cells rounded; D, larger filaments occur with dense cytoplasm; E, F, filaments showing a single pyrenoid at the center of cells (arrowheads); G, H, pyrenoids stained with iodine solution (arrowheads); I-M, elongate zoospores (s) have differentiated in an intercalary cell (I) and escape from a pore at the apical end of cells (J-M: arrows); zoospores often fail to escape through the pore and germinate inside the sporangium (K-M), occasionally even forming holdfasts (asterisk in M). Scale bars: A, 50 μm; B, D-I, 10 μm; C, J-M, 20 μm.
Figure 5 in Flow cytometric measurements as a proxy for sporulation intensity in the cultured macroalga Ulva (Chlorophyta)
Figure 5: Sporulation index (SPI) for gametophytes of Ulva rigida after induction of gametogenesis at different temperatures (A) and irradiances (B). Experiment performed according workflow shown in Figure 1. Significant differences among means are indicated by different letters. Error bars represent mean ± standard deviation (n = 3).
Figure 4 in Flow cytometric measurements as a proxy for sporulation intensity in the cultured macroalga Ulva (Chlorophyta)
Figure 4: Gamete counts of Ulva mutabilis collected from well-mixed culture medium. (A) Fluorescence of a dilution series of gametes measured using a plate reader. (B) For method validation, number of gametes measured by light-scattering flow cytometry (FCM) was compared with number of gametes determined by the Neubauer improved chamber. Error bars represent the mean ± standard deviation (n = 3).
Figure 1 in Flow cytometric measurements as a proxy for sporulation intensity in the cultured macroalga Ulva (Chlorophyta)
Figure 1: Workflow to determine sporulation index (SPI). (i): (a) Ulva rigida thalli collected from cultivation tank. (b) Thalli dried at 20 °C for 1 h. (c) Three pieces of 1 cm2 U. rigida cut from each specimen used in experiment and left to dry together with thallus. (d) Each specimen photographed using light microscope (and area of known number of cells measured. (ii): (e) Fresh thalli chopped to induce sporulation. (f) Fragments weighed, washed with seawater, and inoculated into incubation flask. (g) After differentiation of thallus cells into gametangia, release of gametes induced through change of culture medium (Vtotal), defined volume (VFCM) of well-mixed culture medium (Vtotal) fixed with 2% glutaraldehyde before measuring number of gametes using flow cytometer and calculating total numbers in Vtotal. (iii): (h) Using cells per unit area and weight of 1 cm2, number of thallus cells in each flask calculated. SPI combined number of gametes discharged with number of thallus cells in incubation flask.
Figure 3 in Flow cytometric measurements as a proxy for sporulation intensity in the cultured macroalga Ulva (Chlorophyta)
Figure 3: Flow cytometric measurements used to compare active with inactivate gametes of Ulva mutabilis. (i, ii) Mobile gametes were collected at the brightest spot and prepared for flow cytometric measurements. (iii, iv) Gametes were collected at the brightest spot as well. After chlorophyll removal, they were prepared for flow cytometric measurements. Plots present populations of gametes separated by their expected size (i, iii, % of the total counting events is given) and by the measured chlorophyll autofluorescence (ii, iv). The fluorescence measurements correspond to the gametes framed by the red gates in (i, iii). FSC-H, forward scatter height; SSC-H, side scatter height; FL, fluorescence (Fluo).
Figure 2 in Flow cytometric measurements as a proxy for sporulation intensity in the cultured macroalga Ulva (Chlorophyta)
Figure 2: Distinction of gametes of Ulva mutabilis according to their autofluorescence using flow cytometric measurements. (A: i, ii) Gametes released by U. mutabilis were collected from the green layer in the spotlight (i.e., phototactically active gametes). (A: iii, iv) Gametes were collected after the culture medium was well-mixed. Plots present populations of gametes separated by their expected size (i, iii, % of the total counting events is given) and by the measured chlorophyll autofluorescence (ii, iv). The autofluorescence measurements correspond to the gametes framed by the red gates in (i, iii). (B) Percentages of high-level autofluorescence. Error bars represent mean ± standard deviation (n = 3); FSC-H, forward scatter height; SSC-H, side scatter height; FL, fluorescence (Fluo).
Fig. 6 in Morpho-molecular assessment of Acetabularia jalakanyakae Sp. Nov. (Dasycladales, Chlorophyta) - a new species from Andaman and Nicobar Islands, India
Fig. 6 — Minimum free energy (-37.90 kcal/mol) secondary structure of the pair-wise alignment between Acetabularia dentata and Acetabularia jalakanyakae constructed with RNAalifold 2.4.18. Conserved sites (complimentary base pairing) are highlighted in red, while gap and mismatches are annotated separately
Fig. 3 in Morpho-molecular assessment of Acetabularia jalakanyakae Sp. Nov. (Dasycladales, Chlorophyta) - a new species from Andaman and Nicobar Islands, India
Fig. 3 — SEM images of the sample. (A) Whole image of the sample; (B & C) Top view of the cap; (D) Side view of the cap; (E) Outer ring of lobes; (F) Inner ring of lobes; (G) Hairs in the lobe; and (H) Cap in the early-stage. Scale bar given on the lower left side
Fig. 2 in Morpho-molecular assessment of Acetabularia jalakanyakae Sp. Nov. (Dasycladales, Chlorophyta) - a new species from Andaman and Nicobar Islands, India
Fig. 2 — Light microscopic images of the sample. (A) Whole cap; (B) Cap rays; (C) Outer ring of the lobes; (D) Magnified image of the lobe; and (E & F) Pointed tip of the rays. Scale bar given on the upper right side
Fig. 5 in Morpho-molecular assessment of Acetabularia jalakanyakae Sp. Nov. (Dasycladales, Chlorophyta) - a new species from Andaman and Nicobar Islands, India
Fig. 5 — Maximum likelihood (ML) phylogram based on 18S rDNA sequences using the Kimura 2-Parameter model of molecular evolution in MEGA X. Numbers near nodes represents the ML bootstrap proportion. The newly sequenced Acetabularia jalakanyakae is marked in bold. The tree with the highest log likelihood (-866.21) is shown. The analysis involved 27 nucleotide sequences. All positions having gaps and missing data have been eliminated. Scale bar given on the bottom is in the units of average nucleotide substitutions per site
Fig. 1 in Morpho-molecular assessment of Acetabularia jalakanyakae Sp. Nov. (Dasycladales, Chlorophyta) - a new species from Andaman and Nicobar Islands, India
Fig. 1 — Acetabularia jalakanyakae Sp. Nov. collected from Andaman and Nicobar Islands. (A) Whole sample; and (B) Lower surface of the cap. Scale represents 1 mm distance between two bars
Fig. 4 in Morpho-molecular assessment of Acetabularia jalakanyakae Sp. Nov. (Dasycladales, Chlorophyta) - a new species from Andaman and Nicobar Islands, India
Fig. 4 — SEM images of cap structures of 11 different samples. Samples 4 and 7 with 6 numbers of hairs and all other samples with 7 numbers of hairs. Scale bar given on the upper right side
Supplement materials - An appraisal of Ulva (Ulvophyceae, Chlorophyta) taxonomy
<p>Sequence alignments, supplement figures and tables for the manuscript "An appraisal of <em>Ulva </em>(Ulvophyceae, Chlorophyta) taxonomy"</p>
Figure 3 in High-temperature stress induces bacteria-specific adverse and reversible effects on Ulva (Chlorophyta) growth and its chemosphere in a reductionist model system
Figure 3: Temperature shift experiment from 18 °C to 30 °C. (A) After the temperature shift, the longitudinal growth of the propagules of equal length in three different tripartite communities was measured with ImageJ software and compared with the established model system for
Figure 2 in High-temperature stress induces bacteria-specific adverse and reversible effects on Ulva (Chlorophyta) growth and its chemosphere in a reductionist model system
Figure 2: Bioassay for morphogenetic activity performed at 18 °C. Using a tripartite community with Ulva mutabilis, the morphogenetic activity of the thallusin-releasing bacteria Maribacter sp. was complemented by one out of the four strains isolated from the surface of Ulva ohnoi. Under standard conditions, axenic gametes (A) were cultivated in the tissue culture flask with the tested bacteria alone (B–E), in the presence of Roseovarius sp. (G–J) or with Maribacter sp. MS6 (L–O) in comparison to the controls (F and K). Arrows with closed heads indicate protrusion formation due to the lack of thallusin released by Maribacter sp. Arrows with open heads indicate rhizoid formation in the presence of Maribacter sp. Magnification bar = 100 µm.
Figure 1 in High-temperature stress induces bacteria-specific adverse and reversible effects on Ulva (Chlorophyta) growth and its chemosphere in a reductionist model system
Figure 1: Workflow. Selected bacteria IH2, IH18, IH25, and G8 were collected from the surface of Ulva ohnoi, phenocopying the activity of Roseovarius sp. MS2 and forming a tripartite community with Maribacter sp. MS6 and the gametophyte of Ulva mutabilis (morphotype "slender"; strain FSU-UM5-1). Ulva mutabilis (25 mg dry weight) was cultivated with the two bacterial strains (OD620 = 0.001) under standard conditions (Wichard and Oertel 2010). Propagules of equal length were stressed by a temperature shift from 18 °C to 30 °C using continuous light (80 µmol photon m−2 s−1) to avoid chronobiological effects. Axenic cultures and tripartite communities were prepared according to Spoerner et al. (2012). exo-Metabolomics and multivariate analysis of the metabolite profiling of the supernatant (150 mL) of four tripartite communities were performed according to Alsufyani et al. (2017) and Ghaderiardakani et al. (2022). Drawings of Ulva were taken from Wichard (2023) under the terms of CC BY 4.0. Created with BioRender.com.
Figure 5 in Germanium dioxide as agent to control the biofouling diatom Fragilariopsis oceanica for the cultivation of Ulva fenestrata (Chlorophyta)
Figure 5: GeO2-dependent total diatom density present on the surfaces of Plexiglass water tanks after 14 days of large-scale cultivation of Ulva fenestrata. Data are means of three replicates per treatment (n = 3) and error bars represent standard deviations. Lowercase letters above columns indicate statistically significant differences between the treatments (P <0.001, 1-way ANOVA, Tukey-Kramer HSD post-hoc test).
Figure 1 in Germanium dioxide as agent to control the biofouling diatom Fragilariopsis oceanica for the cultivation of Ulva fenestrata (Chlorophyta)
Figure 1: Photographs of the water tanks used for the cultivation of Ulva fenestrata in the laboratory while being (A) moderately and (B) strongly colonised by Fragilariopsis oceanica.
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