Low Molecular Weight Carbohydrate Patterns in the Bangiophyceae (Rhodophyta)

Karsten, Ulf; West, John A.; Zuccarello, Giuseppe C.; Nixdorf, Oliver; Barrow, Kevin D.; King, Robert

doi:10.1046/j.1529-8817.1999.3550967.x

Cited by 83 publications

(91 citation statements)

References 25 publications

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“…Phylogenetic analysis of G. sulphuraria gene products potentially involved in trehalose biosynthesis and breakdown supports the functional assignments reported above (data not shown). While Suc is the main product of photosynthesis in many green plants, it does not seem to play a major role in red algae (Karsten et al, 1999). Therefore, it was surprising to find genes encoding a putative Suc-P synthase (UDP-Glc:D-Fru-6-P 2-a-D-glucosyltransferase; EC 2.4.1.14) in the C. merolae genome (Table I).…”

Section: Disaccharide Metabolismmentioning

confidence: 99%

“…Floridoside and isofloridoside represent the major soluble carbohydrate in many red algae (Kremer and Kirst, 1981;Karsten et al, 1993Karsten et al, , 1999Li et al, 2001) and thus have a similar role as Suc in green plants. The occurrence of floridoside has been demonstrated for Galdieria and Cyanidium; its occurrence in Cyanidioschyzon, however, is questionable (De Luca and Moretti, 1983;Nagashima and Fukuda, 1983).…”

Section: Osmotic Adaptation and The Split Of The Cyanidiales Into Micmentioning

confidence: 99%

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Comparative Genomics of Two Closely Related Unicellular Thermo-Acidophilic Red Algae, Galdieria sulphuraria and Cyanidioschyzon merolae, Reveals the Molecular Basis of the Metabolic Flexibility of Galdieria sulphuraria and Significant Differences in Carbohydrate Metabolism of Both Algae

et al. 2005

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Unicellular algae serve as models for the study and discovery of metabolic pathways, for the functional dissection of cell biological processes such as organellar division and cell motility, and for the identification of novel genes and gene functions. The recent completion of several algal genome sequences and expressed sequence tag collections and the establishment of nuclear and organellar transformation methods has opened the way for functional genomics approaches using algal model systems. The thermo-acidophilic unicellular red alga Galdieria sulphuraria represents a particularly interesting species for a genomics approach owing to its extraordinary metabolic versatility such as heterotrophic and mixotrophic growth on more than 50 different carbon sources and its adaptation to hot acidic environments. However, the ab initio prediction of genes required for unknown metabolic pathways from genome sequences is not trivial. A compelling strategy for gene identification is the comparison of similarly sized genomes of related organisms with different physiologies. Using this approach, candidate genes were identified that are critical to the metabolic versatility of Galdieria. Expressed sequence tags and high-throughput genomic sequence reads covering .70% of the G. sulphuraria genome were compared to the genome of the unicellular, obligate photoautotrophic red alga Cyanidioschyzon merolae. More than 30% of the Galdieria sequences did not relate to any of the Cyanidioschyzon genes. A closer inspection of these sequences revealed a large number of membrane transporters and enzymes of carbohydrate metabolism that are unique to Galdieria. Based on these data, it is proposed that genes involved in the uptake of reduced carbon compounds and enzymes involved in their metabolism are crucial to the metabolic flexibility of G. sulphuraria.

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Section: Disaccharide Metabolismmentioning

confidence: 99%

Section: Osmotic Adaptation and The Split Of The Cyanidiales Into Micmentioning

confidence: 99%

Comparative Genomics of Two Closely Related Unicellular Thermo-Acidophilic Red Algae, Galdieria sulphuraria and Cyanidioschyzon merolae, Reveals the Molecular Basis of the Metabolic Flexibility of Galdieria sulphuraria and Significant Differences in Carbohydrate Metabolism of Both Algae

et al. 2005

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“…The low molecular weight carbohydrate analysis is outlined in Karsten et al (1999Karsten et al ( , 2003.…”

Section: Carbohydrate Analysismentioning

confidence: 99%

Light and Electron Microscopic Observations on Erythrolobus coxiae gen.et sp.nov. (Porphyridiophyceae, Rhodophyta) from Texas U.S.A.

Scott¹,

Baca²,

Ott³

et al. 2006

ALGAE

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Low molecular weight carbohydrates, phycobilin pigments and cell structure using light and transmission electron microscopy were used to describe a new genus of unicellular red algae, Erythrolobus coxiae (Porphyridiales, Porphyrideophyceae, Rhodophyta). The nucleus of Erythrolobus is located at the cell periphery and the pyrenoid, enclosed by a cytoplasmic starch sheath, is in the cell center. The pyrenoid matrix contains branched tubular thylakoids and four or more chloroplast lobes extend from the pyrenoid along the cell periphery. A peripheral encircling thylakoid is absent. The Golgi apparatus faces outward at the cell periphery and is always associated with a mitochondrion. Porphyridium and Flintiella, the other members of the Porphyrideophyceae, also lack a peripheral encircling thylakoid and have an ER-mitochondria-Golgi association. The low molecular weight carbohydrates digeneaside and floridoside are present, unlike both Porphyridium and Flintiella, which have only floridoside. The phycobilin pigments B-phycoerythrin, R-phycocyanin and allophycocyanin are present, similar to Porphyridium purpureum. The cells have a slow gliding motility without changing shape and do not require substrate contact. The ultrastructural features are unique to members of the Porphyrideophyceae and recent molecular analyses clearly establish the validity of this new red algal class and the genus Erythrolobus.

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“…These two genera seems to be sister species in our phylogenetic analyses. Both genera contain digeneaside and sorbitol as do most genera of the Stylonematophyceae (Karsten et al 1999, Zuccarello et al 2008, Yoon et al 2010. Purpureofilum apyrenoidigerum chloroplasts lack a pyrenoid whereas those of Bangiopsis have a well-defined central pyrenoid.…”

Section: Flintiella Sanguinaria Y119740 Sag4094mentioning

confidence: 99%

A new species of Bangiopsis: B. franklynottii sp. nov. (Stylonematophyceae, Rhodophyta) from Australia and India and comments on the genus

West¹,

Goër²,

Zuccarello³

2014

ALGAE

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Small red algae, especially those previously referred to as 'primitive' are often overlooked, but can be quite abundant. These 'primitive' red algae are now placed in several classes distinct from the Florideophyceae, for example the Stylonematophyceae. A brownish-red filamentous alga was collected from a sandy tide pool at Cape Tribulation, Queensland, Australia. Cultured specimens were identified as Bangiopsis and conformed to the morphological characters of the genus (multicellular base, erect filaments branched or unbranched, uniseriate to multiseriate-tubular, single multilobed purple-red to red-brown plastid with central pyrenoid, vegetative cells released directly as spores). Molecular data of two plastid genes (rbcL, psbA) support placement of the Australian isolate and isolates from India in Bangiopsis. The genetic variation between these isolates and isolates from Puerto Rico previously attributed to B. subsimplex indicates that these should be considered as a separate species. As the type locality is in the Atlantic Ocean, French Guiana, and not far from Puerto Rico, and the Puerto Rican isolate has been used often in phylogenetic analyses, we propose that the Indian and Pacific Ocean isolates be designated a new species, B. franklynottii, to acknowledge Ott's many years of research on inconspicuous freshwater and marine red algae. Our research also highlights the lack of careful descriptions in many of the records of this genus and the lack of morphological characters to distinguish species. Especially within the morphologically simple red algae, morphological distinctness does not necessarily reflect evolutionary divergences.

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Low Molecular Weight Carbohydrate Patterns in the Bangiophyceae (Rhodophyta)

Cited by 83 publications

References 25 publications

Comparative Genomics of Two Closely Related Unicellular Thermo-Acidophilic Red Algae, Galdieria sulphuraria and Cyanidioschyzon merolae, Reveals the Molecular Basis of the Metabolic Flexibility of Galdieria sulphuraria and Significant Differences in Carbohydrate Metabolism of Both Algae

Comparative Genomics of Two Closely Related Unicellular Thermo-Acidophilic Red Algae, Galdieria sulphuraria and Cyanidioschyzon merolae, Reveals the Molecular Basis of the Metabolic Flexibility of Galdieria sulphuraria and Significant Differences in Carbohydrate Metabolism of Both Algae

Light and Electron Microscopic Observations on Erythrolobus coxiae gen.et sp.nov. (Porphyridiophyceae, Rhodophyta) from Texas U.S.A.

A new species of Bangiopsis: B. franklynottii sp. nov. (Stylonematophyceae, Rhodophyta) from Australia and India and comments on the genus

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