Bangiophytes: From one Class to Six; Where Do We Go from Here?

Müller, Kirsten M.; Lynch, Michael D. J.; Sheath, Robert G.

doi:10.1007/978-90-481-3795-4_13

Cited by 4 publications

(2 citation statements)

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“…The classification of red algae is now being revisited with increasing data of molecular phylogeny. Basal red algae have been included in at least five recently proposed subclasses: Cyanidophyceae, Rhodellophyceae, Porphyridiophyceae, Compsopogonophyceae, and Stylonematophyceae (Yoon et al 2006(Yoon et al , 2010Zuccarello et al 2008;Müller et al 2010). Chroodactylon is included within the Stylenomatophyceae, which comprises both filamentous and unicellular taxa (Yoon et al 2006(Yoon et al , 2010.…”

Section: Introductionmentioning

confidence: 99%

A sulfated galactan from the mucilaginous sheath of the red filamentous alga Chroodactylon ornatum (Stylonematophyceae, Rhodophyta)

2014

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The pseudofilamentous red alga Chroodactylon ornatum was grown in f/2 culture medium with the addition of 10, 34, and 100 μM (nominal concentration) cupric sulfate. The bioassays were terminated at two selected end points (days 4 and 12). Growth inhibition, changes in pigment composition, and oxidative stress indicators such as phenolic compounds and lipid peroxidation (dosed as thiobarbituric reactive substances) were observed in cultures with 34 and 100-μM cupric sulfate. Quinacrine (Atebrin) and chlorotetracycline fluorochromes showed abundant vacuoles of acidic content, related with mucilage secretion. Structural analyses by methylation, desulfation-methylation, alkaline treatment, and NMR spectroscopy revealed that the mucilaginous sheath of C. ornatum contains a sulfated galactan with a backbone of alternating 3-linked β-D-galactopyranose and 4-linked α-L-galactopyranose moieties, i.e., an agaran. The absence of 3,6-anhydrogalactose and of its precursor unit (α-galactose 6-sulfate) were confirmed. The highly sulfated polysaccharide contained these ester groups on the C-2 and C-4 hydroxyl groups of the 3-linked unit and on C-3 of the 4-linked units. The large proportion of sulfate esterification in this polysaccharide can be related to the extracellular biosorption of copper divalent cation (2.5±0.4 mg per gram of dry weight) and to copper tolerance in bioassays.

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Section: Introductionmentioning

confidence: 99%

A sulfated galactan from the mucilaginous sheath of the red filamentous alga Chroodactylon ornatum (Stylonematophyceae, Rhodophyta)

2014

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“…The freshwater red algal genus, Compsopogon, is a member of the order Compsopogonales within the Class Compsopogonophyceae (Yoon et al, 2006;Müller et al, 2010). This order used to include only two genera: Boldia, with a monostromatic and hollow sac-like thallus without pit plugs; and Compsopogon, with a uniaxial to corticated multistromatic and usually compact thallus, with simple pit plugs, this last most likely representing a primitive state (Scott et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Global sampling reveals low genetic diversity withinCompsopogon(Compsopogonales, Rhodophyta)

Necchi

Fo.

Salomaki

et al. 2013

European Journal of Phycology

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Twenty-five specimens of the freshwater red alga Compsopogon were collected from locations in North America, South America, Europe, Asia, Australasia and Oceania, and from an aquarium, with the goal of determining genetic diversity among specimens and ascertaining the number of phylogenetic species. Specimens were morphologically identified as having either the 'caeruleus' morphology, with regular polyhedral cortical cells, or the 'leptoclados' morphology, with irregular cortical cells with rhizoidal outgrowths. The 'leptoclados' morphology has been used by some researchers to distinguish the genus Compsopogonopsis from Compsopogon, or at least to distinguish C. leptoclados from other Compsopogon species. Sequence data for the rbcL gene and cox1 barcoding region were obtained for most specimens. In addition, SSU and partial LSU (barcode) rDNA were explored for a few specimens, but all sequences were identical. For the 25 newly generated and eight previously published rbcL gene data, there were seven unique haplotypes, but the sequence divergence was very low (≤7 bp, ≤ 0.7%). One haplotype was widespread, represented by 21 specimens from diverse locations in all regions sampled. Likewise, the 22 new and one previously published cox1 barcode region sequences yielded seven unique haplotypes with little sequence divergence (≤13 bp, ≤ 2.0%). One haplotype was widespread, being shared among 16 specimens from all regions. The combined molecular and morphological data showed no genetic differentiation between the 'caeruleus' and 'leptoclados' morphologies. The ubiquitous distribution of Compsopogon in tropical/subtropical regions and its low genetic variation are probably facilitated by the alga's ability to tolerate a wide range of stream conditions and its propagation via asexual spores. Given the findings of previous culture-based studies, morphometric research and field observations, coupled with the results of our study, we conclude there is only a single monospecific genus worldwide and that the species is correctly called C. caeruleus, since this is the oldest validly published name; all other previously described species of Compsopogon and Compsopogonopsis are synonyms.

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Red Algae (Rhodophyta) in Rivers

NecchiJr.

2016

River Algae

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Bangiophytes: From one Class to Six; Where Do We Go from Here?

Cited by 4 publications

References 65 publications

A sulfated galactan from the mucilaginous sheath of the red filamentous alga Chroodactylon ornatum (Stylonematophyceae, Rhodophyta)

A sulfated galactan from the mucilaginous sheath of the red filamentous alga Chroodactylon ornatum (Stylonematophyceae, Rhodophyta)

Global sampling reveals low genetic diversity withinCompsopogon(Compsopogonales, Rhodophyta)

Red Algae (Rhodophyta) in Rivers

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