Redefining the taxonomic status ofLaurencia dendroidea(Ceramiales, Rhodophyta) from Brazil and the Canary Islands

Cassano, Valéria; Metti, Yola; Millar, Alan J. K.; Gil-Rodríguez, M. C.; Sentíes, Abel; Díaz‐Larrea, Jhoana; Oliveira, Mariana Cabral de; Fujii, Mutuê T.

doi:10.1080/09670262.2011.647334

Cited by 29 publications

(36 citation statements)

References 35 publications

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“…Table 2. The interspecific divergence values obtained in this study were similar to those previously reported for the Laurencia complex , McIvor et al 2002, Díaz-Larrea et al 2007, 2012a, b, Martin-Lescanne et al 2010, Rocha-Jorge et al 2010.…”

Section: Introductionsupporting

confidence: 80%

Osmundea sanctarum sp. nov. (Ceramiales, Rhodophyta) from the southwestern Atlantic Ocean

Rocha-Jorge¹,

Cassano²,

Barros-Barreto³

et al. 2013

Phytotaxa

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An ongoing phycological survey in the Laje de Santos Marine State Park (LSMSP) of São Paulo in southeastern Brazil revealed a previously undescribed species of Osmundea (Rhodophyta, Rhodomelaceae), which was found in the subtidal zone at a depth of 7 to 20 m. Morphological studies conducted on Osmundea specimens collected in the LSMSP revealed characteristics typical of the genus Osmundea, including two pericentral cells per each axial segment and tetrasporangia cut off randomly from cortical cells. The phylogenetic position of this species was inferred by analysis of chloroplastencoded rbcL gene sequences from 37 taxa, including one Rhodomelaceae and one Ceramiaceae as outgroups. The Brazilian species of Osmundea formed a well-supported clade with the 'Spectabilis' group from the coast of Pacific North America, composed of O. spectabilis, O. blinksii, O. splendens and O. sinicola. The present species, however, diverged greatly from the 'Spectabilis' group representatives (5.4-7.1%), which confirms that it constitutes a different taxonomic entity, herein proposed as the new species Osmundea sanctarum M.T. Fujii & Rocha-Jorge. This is the first report of a member of Osmundea related to the 'Spectabilis' group in the South Atlantic Ocean.

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Section: Introductionsupporting

confidence: 80%

Osmundea sanctarum sp. nov. (Ceramiales, Rhodophyta) from the southwestern Atlantic Ocean

Rocha-Jorge¹,

Cassano²,

Barros-Barreto³

et al. 2013

Phytotaxa

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“…Most species in the present samples were Rhodophyta; there were only a few species of Phaeophyceae and Chlorophyta although in both collections, the foliose Zonaria tournefortii was dominant and served as a host substratum for epiphytic algae. The list presented here (Table 1) is provisional as some of the species included are problematic; examples include Bryopsis hypnoides (Brodie et al 2007), Laurencia obtusa (Cassano et al 2012), Lobophora variegata (Sun et al 2012), and Plocamium cartilagineum (Saunders and Lemkuhl 2005). Of the 43 algae identified to species, 40 occur in the Mediterranean Sea while 33 occur in the Macaronesian archipelagos (Azores, Madeira, Canaries).…”

Section: Discussionmentioning

confidence: 99%

Preliminary observations on the benthic marine algae of the Gorringe seabank (northeast Atlantic Ocean)

2014

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Examination of marine samples collected in 2006 from the Gettysburg and Ormonde seamounts on the Gorringe seabank southwest of Portugal has revealed 29 benthic Chlorophyta, Phaeophyceae (Ochrophyta), and Rhodophyta that were identified provisionally to genus and to species. Combining lists for the present and a previous expedition brings the total of algae thus far recorded to 48. The brown alga Zonaria tournefourtii and the red alga Cryptopleura ramosa were the most abundant species in the present collections. The kelp Laminaria ochroleuca was present only in the Gettysburg samples while Saccorhiza polyschides was observed only on the Ormonde seamount. Comparisons with the benthic marine algae recorded on seamounts in the mid-Atlantic Azores archipelago show features in common, notably kelp forests of L. ochroleuca at depths below 30 m and Z. tournefortii dominance in shallower waters.

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“…It is found from the intertidal to the subtidal zone at 3m depth. The thalli are erect, forming dense tufts 4–20 cm high, brown-purple or violet-greenish in color [1]. The genus Laurencia [2] was recognized, since the first studies on natural products in the 1960s, as an important source of secondary metabolites, mainly halogenated compounds [3,4].…”

Section: Introductionmentioning

confidence: 99%

Transcriptomic analysis of the red seaweed Laurencia dendroidea (Florideophyceae, Rhodophyta) and its microbiome

et al. 2012

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BackgroundSeaweeds of the Laurencia genus have a broad geographic distribution and are largely recognized as important sources of secondary metabolites, mainly halogenated compounds exhibiting diverse potential pharmacological activities and relevant ecological role as anti-epibiosis. Host-microbe interaction is a driving force for co-evolution in the marine environment, but molecular studies of seaweed-associated microbial communities are still rare. Despite the large amount of research describing the chemical compositions of Laurencia species, the genetic knowledge regarding this genus is currently restricted to taxonomic markers and general genome features. In this work we analyze the transcriptomic profile of L. dendroidea J. Agardh, unveil the genes involved on the biosynthesis of terpenoid compounds in this seaweed and explore the interactions between this host and its associated microbiome.ResultsA total of 6 transcriptomes were obtained from specimens of L. dendroidea sampled in three different coastal locations of the Rio de Janeiro state. Functional annotations revealed predominantly basic cellular metabolic pathways. Bacteria was the dominant active group in the microbiome of L. dendroidea, standing out nitrogen fixing Cyanobacteria and aerobic heterotrophic Proteobacteria. The analysis of the relative contribution of each domain highlighted bacterial features related to glycolysis, lipid and polysaccharide breakdown, and also recognition of seaweed surface and establishment of biofilm. Eukaryotic transcripts, on the other hand, were associated with photosynthesis, synthesis of carbohydrate reserves, and defense mechanisms, including the biosynthesis of terpenoids through the mevalonate-independent pathway.ConclusionsThis work describes the first transcriptomic profile of the red seaweed L. dendroidea, increasing the knowledge about ESTs from the Florideophyceae algal class. Our data suggest an important role for L. dendroidea in the primary production of the holobiont and the role of Bacteria as consumers of organic matter and possibly also as nitrogen source. Furthermore, this seaweed expressed sequences related to terpene biosynthesis, including the complete mevalonate-independent pathway, which offers new possibilities for biotechnological applications using secondary metabolites from L. dendroidea.

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Redefining the taxonomic status ofLaurencia dendroidea(Ceramiales, Rhodophyta) from Brazil and the Canary Islands

Cited by 29 publications

References 35 publications

<i>Osmundea sanctarum sp. nov.</i> (Ceramiales, Rhodophyta) from the southwestern Atlantic Ocean

<i>Osmundea sanctarum sp. nov.</i> (Ceramiales, Rhodophyta) from the southwestern Atlantic Ocean

Preliminary observations on the benthic marine algae of the Gorringe seabank (northeast Atlantic Ocean)

Transcriptomic analysis of the red seaweed Laurencia dendroidea (Florideophyceae, Rhodophyta) and its microbiome

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