A taxonomic re-evaluation of the Pedinellales (Dictyochophyceae), based on morphological, behavioural and molecular data

Sekiguchi, Hiroshi; Kawachi, Masanobu; Nakayama, Tsuneyoshi; Inouye, Isao

doi:10.2216/i0031-8884-42-2-165.1

Cited by 18 publications

(32 citation statements)

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“…Figures S2a and c), while heterokont silicoflagellates (Dictyochophyceae; 51%) replaced diatoms (26%) as the dominant taxa sequenced from WKI sea ice (Supplementary Figure 2b). The latter were overwhelmingly Pedinellales; mixotrophic algae (Sekiguchi et al, 2003) associated with icecovered habitats (Thomsen 1988), which constituted o1% in the other communities. Dinoflagellates accounted for 7% and 8 % of sequences from BFS and WDS, respectively, and only 2% in sea ice (WKI).…”

Section: Resultsmentioning

confidence: 99%

Metatranscriptomes reveal functional variation in diatom communities from the Antarctic Peninsula

et al. 2015

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Functional genomics of diatom-dominated communities from the Antarctic Peninsula was studied using comparative metatranscriptomics. Samples obtained from diatom-rich communities in the Bransfield Strait, the western Weddell Sea and sea ice in the Bellingshausen Sea/Wilkins Ice Shelf yielded more than 500K pyrosequencing reads that were combined to produce a global metatranscriptome assembly. Multi-gene phylogenies recovered three distinct communities, and diatom-assigned contigs further indicated little read-sharing between communities, validating an assembly-based annotation and analysis approach. Although functional analysis recovered a core of abundant shared annotations that were expressed across the three diatom communities, over 40% of annotations (but accounting for o10% of sequences) were community-specific. The two pelagic communities differed in their expression of N-metabolism and acquisition genes, which was almost absent in post-bloom conditions in the Weddell Sea community, while enrichment of transporters for ammonia and urea in Bransfield Strait diatoms suggests a physiological stance towards acquisition of reduced N-sources. The depletion of carbohydrate and energy metabolism pathways in sea ice relative to pelagic communities, together with increased light energy dissipation (via LHCSR proteins), photorespiration, and NO 3 − uptake and utilization all pointed to irradiance stress and/or inorganic carbon limitation within sea ice. Ice-binding proteins and cold-shock transcription factors were also enriched in sea ice diatoms. Surprisingly, the abundance of gene transcripts for the translational machinery tracked decreasing environmental temperature across only a 4°C range, possibly reflecting constraints on translational efficiency and protein production in cold environments.

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Section: Resultsmentioning

confidence: 99%

Metatranscriptomes reveal functional variation in diatom communities from the Antarctic Peninsula

et al. 2015

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“…Supporting this hypothesis, individuals with 3 and 6 chloroplasts were observed. Seven species of Pseudopedinella are mentioned in the literature (Sekiguchi et al 2003;Table S1 in the Supplement). However, based on Guiry & Guiry (2015), there are 3 confirmed species: P. pyriformis ('pyriforme', as the Holotype of the genus), P. elastica and P. thomsenii, while the confirmation of a fourth species of this genus (P. erkensis) is considered to require further investigation.…”

Section: Discussionmentioning

confidence: 99%

“…However, based on Guiry & Guiry (2015), there are 3 confirmed species: P. pyriformis ('pyriforme', as the Holotype of the genus), P. elastica and P. thomsenii, while the confirmation of a fourth species of this genus (P. erkensis) is considered to require further investigation. The individuals with 3 chloroplasts correspond to P. thomsenii (Sekiguchi et al 2003), which is the only species of this genus which possesses 3 chloroplasts (Thomsen 1988). The individuals with 6 chloroplasts could not be determined to a finer taxonomic detail, which requires observation of ultrastructural features.…”

Section: Discussionmentioning

confidence: 99%

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Presence, abundance and bacterivory of the mixotrophic algae Pseudopedinella (Dictyochophyceae) in freshwater environments

Gerea¹,

Saad²,

Izaguirre³

et al. 2016

Aquat. Microb. Ecol.

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“…Therefore, we designed an oligonucleotide probe that is specific for the lineages Pedinellales/Rhizochromulinales, a subgroup of the Dictyophyceae within the Heterokonta (stramenopiles). A taxonomic re-evaluation and phylogenetic classification of this group is given by Sekiguchi et al (2003).…”

Section: Probe Design and Detection Of Targeted Protists In Environmementioning

confidence: 99%

Quantification and distinction of aplastidic and plastidic marine nanoplankton by fluorescence in situ hybridization

Beardsley

Knittel

Amann

2005

Aquat. Microb. Ecol.

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A taxonomic re-evaluation of the Pedinellales (Dictyochophyceae), based on morphological, behavioural and molecular data

Cited by 18 publications

References 0 publications

Metatranscriptomes reveal functional variation in diatom communities from the Antarctic Peninsula

Metatranscriptomes reveal functional variation in diatom communities from the Antarctic Peninsula

Presence, abundance and bacterivory of the mixotrophic algae Pseudopedinella (Dictyochophyceae) in freshwater environments

Quantification and distinction of aplastidic and plastidic marine nanoplankton by fluorescence in situ hybridization

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