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[PMID]:27166980
[Au] Autor:Zhou L; Chen J; Xu J; Li Y; Zhou C; Yan X
[Ad] Endereço:School of Marine Sciences, Ningbo University, Ningbo, 315211, China.
[Ti] Título:Change of volatile components in six microalgae with different growth phases.
[So] Source:J Sci Food Agric;97(3):761-769, 2017 Feb.
[Is] ISSN:1097-0010
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Head space solid-phase microextraction-gas chromatography-mass spectrometry has been applied to analyze the volatile components of six marine microalgae (Thalassiosira weissflogii, Nitzschia closterium, Chaetoceros calcitrans, Platymonas helgolandica, Nannochloropsis spp. and Dicrateria inornata) from Bacillariophyta, Chlorophyta and Chrysophyta, respectively, in different growth phases. RESULTS: All volatile compounds were identified by database searching in the NIST08 Mass Spectral Library and analyzed by principal component analysis with SIMCA-P software (Umetrics, Umea, Sweden). The results clearly revealed that the volatile components of the six microalgae were significantly different in the exponential, stationary and declining phases. Aldehydes, alkanes, some esters and dimethyl sulfide significantly changed in different growth phases. CONCLUSION: This is the first report on the comprehensive characteristics of volatile components in different microalgae and in different growth phases. The results may provide reference data for studies on the flavor of cultivated aquatic organism, odor formation in nature water, choice of feeding period and microalgae species selection for the artificial rearing of marine organisms. © 2016 Society of Chemical Industry.
[Mh] Termos MeSH primário: Clorófitas/química
Chrysophyta/química
Diatomáceas/química
Microalgas/química
Compostos Orgânicos Voláteis/análise
[Mh] Termos MeSH secundário: Ciclo Celular
China
Clorófitas/crescimento & desenvolvimento
Clorófitas/metabolismo
Chrysophyta/crescimento & desenvolvimento
Chrysophyta/metabolismo
Bases de Dados de Compostos Químicos
Diatomáceas/crescimento & desenvolvimento
Diatomáceas/metabolismo
Análise Discriminante
Cromatografia Gasosa-Espectrometria de Massas
Microalgas/crescimento & desenvolvimento
Microalgas/metabolismo
Análise Multivariada
Análise de Componente Principal
Microextração em Fase Sólida
Especificidade da Espécie
Compostos Orgânicos Voláteis/química
Compostos Orgânicos Voláteis/metabolismo
Volatilização
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Volatile Organic Compounds)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170619
[Lr] Data última revisão:
170619
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160512
[St] Status:MEDLINE
[do] DOI:10.1002/jsfa.7794


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[PMID]:27418202
[Au] Autor:Li X; Yu J; Guo Q; Su M; Liu T; Yang M; Zhao Y
[Ad] Endereço:Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
[Ti] Título:Source-water odor during winter in the Yellow River area of China: Occurrence and diagnosis.
[So] Source:Environ Pollut;218:252-258, 2016 Nov.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Yellow River source water has long suffered from odor problems in winter. In this study, odor characteristics, potential odorants, and algae in the source water of six cities (Lanzhou, Yinchuan, Hohhot, Zhengzhou, Jinan and Dongying) along the Yellow River were determined in winter (February to March 2014). According to flavor profile analysis (FPA), moderate to strong fishy odors occurred in all cities, except for Lanzhou. At the same time, mild earthy/musty odors and septic/swampy odors were also detected. The strong fishy odor (FPA intensity, 8.5) in Yinchuan was attributed to the abnormal growth of Dinobryon (cell density, 5.7 × 10 cells/mL), while the fishy odors in Hohhot, Zhengzhou, Jinan, and Dongying might be caused by Melosira and Cyclotella, Cryptomonas, Dinobryon, and Synedra, respectively. Unsaturated aldehydes, which have been reported to cause fishy odors, were not detected in all samples. However, some saturated aldehydes, including hexanal, heptanal, nonanal, decanal, and benzaldehyde, were detected with a total concentration range of 690 ng/L to 2166 ng/L, and might have partly contributed to the fishy odors. In addition, 2-MIB (5.77-21.12 ng/L) and geosmin (2.26-9.73 ng/L) were responsible for the earthy/musty odors in the Yellow River source waters, and dimethyl disulfide (648.2 ng/L) was responsible for the rancid/swampy odor (FPA intensity, 8.0) episode in Yinchuan. This is a comprehensive study reporting on the occurrence and possible reasons for the odor issues in the Yellow River source water during winter.
[Mh] Termos MeSH primário: Odorantes/análise
Rios/química
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Aldeídos/análise
Animais
China
Chrysophyta
Diatomáceas
Dissulfetos/análise
Estações do Ano
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Aldehydes); 0 (Disulfides); 0 (Water Pollutants, Chemical); 3P8D642K5E (dimethyl disulfide)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170923
[Lr] Data última revisão:
170923
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160716
[St] Status:MEDLINE


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[PMID]:26662881
[Au] Autor:Grossmann L; Bock C; Schweikert M; Boenigk J
[Ad] Endereço:Department of Biodiversity, University of Duisburg-Essen, Universitätsstrasse 5, 45141, Essen, Germany.
[Ti] Título:Small but Manifold - Hidden Diversity in "Spumella-like Flagellates".
[So] Source:J Eukaryot Microbiol;63(4):419-39, 2016 Jul.
[Is] ISSN:1550-7408
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Colourless, nonscaled chrysophytes comprise morphologically similar or even indistinguishable flagellates which are important bacterivors in water and soil crucial for ecosystem functioning. However, phylogenetic analyses indicate a multiple origin of such colourless, nonscaled flagellate lineages. These flagellates are often referred to as "Spumella-like flagellates" in ecological and biogeographic studies. Although this denomination reflects an assumed polyphyly, it obscures the phylogenetic and taxonomic diversity of this important flagellate group and, thus, hinders progress in lineage- and taxon-specific ecological surveys. The smallest representatives of colourless chrysophytes have been addressed in very few taxonomic studies although they are among the dominant flagellates in field communities. To overcome the blurred picture and set the field for further investigation in biogeography and ecology of the organisms in question, we studied a set of strains of specifically small, colourless, nonscaled chrysomonad flagellates by means of electron microscopy and molecular analyses. They were isolated by a filtration-acclimatisation approach focusing on flagellates of around 5 µm. We present the phylogenetic position of eight different lineages on both the ordinal and the generic level. Accordingly, we describe the new genera Apoikiospumella, Chromulinospumella, Segregatospumella, Cornospumella and Acrispumella Boenigk et Grossmann n. g. and different species within them.
[Mh] Termos MeSH primário: Biodiversidade
Chrysophyta/classificação
Filogenia
Estramenópilas/classificação
[Mh] Termos MeSH secundário: Chrysophyta/genética
Chrysophyta/ultraestrutura
Cadeia Alimentar
Microscopia Eletrônica
Reação em Cadeia da Polimerase
Água do Mar
Análise de Sequência de DNA
Estramenópilas/genética
Estramenópilas/ultraestrutura
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170628
[Lr] Data última revisão:
170628
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151215
[St] Status:MEDLINE
[do] DOI:10.1111/jeu.12287


  4 / 77 MEDLINE  
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[PMID]:26541331
[Au] Autor:Touloupakis E; Cicchi B; Benavides AM; Torzillo G
[Ad] Endereço:Istituto per lo Studio degli Ecosistemi, CNR, Via Madonna del Piano 10, I-50019, Sesto Fiorentino, Italy.
[Ti] Título:Effect of high pH on growth of Synechocystis sp. PCC 6803 cultures and their contamination by golden algae (Poterioochromonas sp.).
[So] Source:Appl Microbiol Biotechnol;100(3):1333-41, 2016 Feb.
[Is] ISSN:1432-0614
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Culturing cyanobacteria in a highly alkaline environment is a possible strategy for controlling contamination by other organisms. Synechocystis PCC 6803 cells were grown in continuous cultures to assess their growth performance at different pH values. Light conversion efficiency linearly decreased with the increase in pH and ranged between 12.5 % (PAR) at pH 7.5 (optimal) and decreased to 8.9 % at pH 11.0. Photosynthetic activity, assessed by measuring both chlorophyll fluorescence and photosynthesis rate, was not much affected going from pH 7.5 to 11.0, while productivity, growth yield, and biomass yield on light energy declined by 32, 28, and 26 % respectively at pH 11.0. Biochemical composition of the biomass did not change much within pH 7 and 10, while when grown at pH 11.0, carbohydrate content increased by 33 % while lipid content decreased by about the same amount. Protein content remained almost constant (average 65.8 % of dry weight). Cultures maintained at pH above 11.0 could grow free of contaminants (protozoa and other competing microalgae belonging to the species of Poterioochromonas).
[Mh] Termos MeSH primário: Chrysophyta/crescimento & desenvolvimento
Meios de Cultura/química
Synechocystis/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Proteínas de Bactérias/metabolismo
Técnicas de Cultura Celular por Lotes/instrumentação
Meios de Cultura/metabolismo
Concentração de Íons de Hidrogênio
Fotossíntese
Synechocystis/química
Synechocystis/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Bacterial Proteins); 0 (Culture Media)
[Em] Mês de entrada:1610
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151107
[St] Status:MEDLINE
[do] DOI:10.1007/s00253-015-7024-0


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[PMID]:26395963
[Au] Autor:Jacob AP; Culver DA; Lanno RP; Voigt A
[Ad] Endereço:Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, Columbus, Ohio, USA.
[Ti] Título:Ecological impacts of fluridone and copper sulphate in catfish aquaculture ponds.
[So] Source:Environ Toxicol Chem;35(5):1183-94, 2016 May.
[Is] ISSN:1552-8618
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Fluridone and copper sulphate are often used for controlling macrophytes and algae in aquaculture ponds. The present study examined the ecological effects of these chemicals on macrophyte, phytoplankton, and zooplankton biomass; plankton community structure; water quality parameters; and fish survival and yield in catfish culture ponds using a randomized complete block design. The estimated half-life of fluridone in the individual ponds ranged from 1.6 d to 10.8 d. Free copper ion activity in ponds treated with copper sulphate was dynamic, ranging from pCu of 7.7 to 8.9 after each application and decreasing to approximately 12 (1 × 10(-12) M) within 1 wk after each application, approaching observed values in control ponds (pCu = 12.3-13.4). No difference in macrophyte biomass was observed among treatments. Fluridone and copper treatments elicited different responses within the phytoplankton community. Copper treatments reduced Cyanophyta biomass but increased biomass of more tolerant taxa among the Chlorophyta and Chrysophyta. Fluridone treatments reduced total phytoplankton biomass including Cyanophyta and increased the sensitivity of Chlorophyta and Chrysophyta to copper. Copper also affected zooplankton community composition as a result of direct toxic effects on sensitive zooplankton taxa (e.g., Cladocera), whereas Copepoda biomass in copper-treated ponds exceeded that in controls. Catfish survival and yield were not significantly different among treatments. The results of the present study suggest that fluridone and copper interact at realistic application rates, increasing the ability to control algae compared with treatments where they are applied alone.
[Mh] Termos MeSH primário: Peixes-Gato
Sulfato de Cobre/toxicidade
Piridonas/toxicidade
[Mh] Termos MeSH secundário: Animais
Aquicultura
Biomassa
Clorófitas/efeitos dos fármacos
Chrysophyta/efeitos dos fármacos
Meia-Vida
Fitoplâncton/efeitos dos fármacos
Tanques
Qualidade da Água
Zooplâncton/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (Pyridones); 3L0JQA61JX (fluridone); LRX7AJ16DT (Copper Sulfate)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150924
[St] Status:MEDLINE
[do] DOI:10.1002/etc.3258


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[PMID]:26615444
[Au] Autor:Belevich TA; Ilyash LV; Milyutina IA; Logacheva MD; Goryunov DV; Troitsky AV
[Ad] Endereço:Lomonosov Moscow State University, Biological Faculty, Moscow, 119991, Russia.
[Ti] Título:Metagenomic Analyses of White Sea Picoalgae: First Data.
[So] Source:Biochemistry (Mosc);80(11):1514-21, 2015 Nov.
[Is] ISSN:1608-3040
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Picoalgae (defined as cells smaller than 2-3 µm) include members of diverse taxonomic groups. They are an important constituent of marine plankton and ice biota and play a significant ecological role in biogeochemical cycles. Despite their importance, the true extent of their diversity has only recently been uncovered by molecular surveys. The diversity of picoeukaryotes has not yet been studied in the White Sea, which is a unique marine environment combining features of temperate and Arctic seas. Here, we investigated the taxonomic composition of eukaryotic picoalgae in ice and under-ice water at a station located in the Kandalaksha Bay of the White Sea. We applied metagenomic survey using Illumina sequencing. Eight main algae phyla, namely, Chlorophyta, Katablepharidophyta, Haptophyta, Dinophyta, Cercozoa, Bacillariophyta, Cryptophyta, and Ochrophyta were identified. The genera Paraphysomonas and Micromonas and the order Pedinellales were most numerous in plankton; the genera Paraphysomonas, Micromonas, and Metopion were most abundant in ice. The number of "rare" phylotypes was 80 in under-ice water and 112 in ice. Some taxa of nano- and microalgae are identified for the first time in the White Sea phytoplankton. Our data provide a basis for further research of tiny phototrophs in the Russian Arctic.
[Mh] Termos MeSH primário: Chrysophyta/genética
Metagenômica
[Mh] Termos MeSH secundário: Regiões Árticas
Chrysophyta/classificação
DNA de Plantas/química
DNA de Plantas/isolamento & purificação
DNA de Plantas/metabolismo
Oceanos e Mares
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Plant)
[Em] Mês de entrada:1609
[Cu] Atualização por classe:151130
[Lr] Data última revisão:
151130
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151130
[St] Status:MEDLINE
[do] DOI:10.1134/S0006297915110140


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[PMID]:26164906
[Au] Autor:Liang XL; Yang Y; Wang YL; Zhang YM; Zhao ZN; Han XQ; Zhang JD; Gao WM
[Ti] Título:[Yearly Changes of Phytoplankton Community in the Ecology-monitoring Area of Changli, Hebei in Summer].
[So] Source:Huan Jing Ke Xue;36(4):1317-25, 2015 Apr.
[Is] ISSN:0250-3301
[Cp] País de publicação:China
[La] Idioma:chi
[Ab] Resumo:Based on the investigation of phytoplankton and water body nutrient concentration in the ecology-monitoring area of Changli in summer from 2005 to 2013, the phytoplankton community structure was analyzed. The result showed that in recent 9 years, 3 phyla including 23 families, 39 genera and 105 species of phytoplankton were identified, in which 85.7% were diatoms and 13.3% were dinoflagellate. Only one species was found belonging to golden algae. There was great difference in dominant species among different years. According to the value of dominance, there were Coscinodiscus radiatus, Coscinodiscus debilis, Rhizosolenia styliformis, Cerataulina bergoni, Coscinodiscus wailesii, Thalassiosira sp., Ceratium tripos, Chaetoceros lorenzianus, Skeletonema costatum. The cell abundance was decreased yearly. The Shannon-Wiener index of phytoplankton community ranged from 0.015 to 3.889, and the evenness index ranged from 0.009 to 1, which showed little yearly change. And phytoplankton species were unevenly distributed among the 19 sites, there were relatively low amount of dominant species, but the dominance was relatively high. Canonical Correspondence Analysis (CCA) results of the phytoplankton community and its environmental factors showed that the environmental factors influencing the change of phytoplankton community structure in summer included water temperature, nutrients (TP, TN and NO3(-) -N, NH4(+)-N) and salinity, and the structural change was the result of the interactions of different environmental factors.
[Mh] Termos MeSH primário: Fitoplâncton
Estações do Ano
[Mh] Termos MeSH secundário: China
Chrysophyta
Diatomáceas
Dinoflagelados
Ecossistema
Dinâmica Populacional
[Pt] Tipo de publicação:ENGLISH ABSTRACT; JOURNAL ARTICLE
[Em] Mês de entrada:1508
[Cu] Atualização por classe:161018
[Lr] Data última revisão:
161018
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150714
[St] Status:MEDLINE


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[PMID]:25996303
[Au] Autor:Hagemann M; Pade N
[Ad] Endereço:Abteilung Pflanzenphysiologie, Universität Rostock, Rostock, Germany.
[Ti] Título:Heterosides--compatible solutes occurring in prokaryotic and eukaryotic phototrophs.
[So] Source:Plant Biol (Stuttg);17(5):927-34, 2015 Sep.
[Is] ISSN:1438-8677
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The acclimation to osmotic and/or salt stress conditions induces an integrated response at different cellular levels. One acclimation strategy relies on the massive accumulation of low molecular mass compounds, so-called compatible solutes, to balance osmotic gradients and to directly protect critical macromolecules. Heterosides are compounds composed of a sugar and a polyol moiety that represent one chemical class of compatible solutes with interesting features. Well-investigated examples are glucosylglycerol, which is found in many cyanobacteria, and galactosylglycerols (floridoside and isofloridoside), which are accumulated by eukaryotic algae under salt stress conditions. Here, we review knowledge on physiology, biochemistry and genetics of heteroside accumulation in pro- and eukaryotic photoautotrophic organisms.
[Mh] Termos MeSH primário: Aclimatação
Chrysophyta/fisiologia
Cianobactérias/fisiologia
Galactosídeos/metabolismo
Glucosídeos/metabolismo
Glicerol/análogos & derivados
Rodófitas/fisiologia
[Mh] Termos MeSH secundário: Vias Biossintéticas
Chrysophyta/química
Chrysophyta/genética
Cianobactérias/química
Cianobactérias/genética
Galactosídeos/química
Glucosídeos/química
Glicerol/química
Glicerol/metabolismo
Osmose
Filogenia
Rodófitas/química
Rodófitas/genética
Tolerância a Sal
Estresse Fisiológico
Trealose/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; REVIEW
[Nm] Nome de substância:
0 (2-galactopyranosylglycerol); 0 (Galactosides); 0 (Glucosides); 0 (glucosylglycerol); 4649-46-1 (isofloridoside); B8WCK70T7I (Trehalose); PDC6A3C0OX (Glycerol)
[Em] Mês de entrada:1607
[Cu] Atualização por classe:150811
[Lr] Data última revisão:
150811
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150522
[St] Status:MEDLINE
[do] DOI:10.1111/plb.12350


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[PMID]:25251384
[Au] Autor:Chronopoulou PM; Sanni GO; Silas-Olu DI; van der Meer JR; Timmis KN; Brussaard CP; McGenity TJ
[Ad] Endereço:School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK.
[Ti] Título:Generalist hydrocarbon-degrading bacterial communities in the oil-polluted water column of the North Sea.
[So] Source:Microb Biotechnol;8(3):434-47, 2015 May.
[Is] ISSN:1751-7915
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The aim of this work was to determine the effect of light crude oil on bacterial communities during an experimental oil spill in the North Sea and in mesocosms (simulating a heavy, enclosed oil spill), and to isolate and characterize hydrocarbon-degrading bacteria from the water column. No oil-induced changes in bacterial community (3 m below the sea surface) were observed 32 h after the experimental spill at sea. In contrast, there was a decrease in the dominant SAR11 phylotype and an increase in Pseudoalteromonas spp. in the oiled mesocosms (investigated by 16S rRNA gene analysis using denaturing gradient gel electrophoresis), as a consequence of the longer incubation, closer proximity of the samples to oil, and the lack of replenishment with seawater. A total of 216 strains were isolated from hydrocarbon enrichment cultures, predominantly belonging to the genus Pseudoaltero monas; most strains grew on PAHs, branched and straight-chain alkanes, as well as many other carbon sources. No obligate hydrocarbonoclastic bacteria were isolated or detected, highlighting the potential importance of cosmopolitan marine generalists like Pseudoalteromonas spp. in degrading hydrocarbons in the water column beneath an oil slick, and revealing the susceptibility to oil pollution of SAR11, the most abundant bacterial clade in the surface ocean.
[Mh] Termos MeSH primário: Bactérias/classificação
Bactérias/efeitos dos fármacos
Biota/efeitos dos fármacos
Hidrocarbonetos/metabolismo
Óleos/metabolismo
Água do Mar/microbiologia
[Mh] Termos MeSH secundário: Bactérias/genética
Bactérias/isolamento & purificação
Biotransformação
Chrysophyta
Análise por Conglomerados
DNA Bacteriano/química
DNA Bacteriano/genética
DNA Ribossômico/química
DNA Ribossômico/genética
Dados de Sequência Molecular
Mar do Norte
Filogenia
Pseudoalteromonas
RNA Ribossômico 16S/genética
Análise de Sequência de DNA
Água
Poluentes da Água/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Bacterial); 0 (DNA, Ribosomal); 0 (Hydrocarbons); 0 (Oils); 0 (RNA, Ribosomal, 16S); 0 (Water Pollutants); 059QF0KO0R (Water)
[Em] Mês de entrada:1601
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140925
[St] Status:MEDLINE
[do] DOI:10.1111/1751-7915.12176


  10 / 77 MEDLINE  
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[PMID]:25456313
[Au] Autor:Scoble JM; Cavalier-Smith T
[Ad] Endereço:Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK. Electronic address: josephine.scoble@zoo.ox.ac.uk.
[Ti] Título:Scale evolution in Paraphysomonadida (Chrysophyceae): Sequence phylogeny and revised taxonomy of Paraphysomonas, new genus Clathromonas, and 25 new species.
[So] Source:Eur J Protistol;50(5):551-92, 2014 Oct.
[Is] ISSN:1618-0429
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Heterotrophic chrysomonads of the genus Paraphysomonas are ubiquitous phagotrophs with diverse silica scale morphology. Over 50 named species have been described by electron microscopy from uncultured environmental samples. Sequence data exist for very few, but the literature reveals misidentification or lumping of most previously sequenced. For critically integrating scale and sequence data, 59 clonal cultures were studied light microscopically, by sequencing 18S ribosomal DNA, and recording scale morphology by transmission electron microscopy. We found strong congruence between variations in scale morphology and rDNA sequences, and unexpectedly deep genetic diversity. We now restrict Paraphysomonas to species with nail-like spine scales, establishing 23 new species and eight subspecies (Paraphysomonadidae). Species having base-plates with dense margins form three distinct subclades; those with a simple margin only two. We move 29 former Paraphysomonas species with basket scales into a new genus, Clathromonas, and describe two new species. Clathromonas belongs to a very distinct rDNA clade (Clathromonadidae fam. n.), possibly distantly sister to Paraphysomonas. Molecular and morphological data are mutually reinforcing; both are needed for evaluating paraphysomonad diversity and confirm excessive past lumping. Former Paraphysomonas species with neither nail-like nor basket scales are here excluded from Paraphysomonas and will be assigned to new genera elsewhere.
[Mh] Termos MeSH primário: Chrysophyta/classificação
Chrysophyta/genética
Filogenia
[Mh] Termos MeSH secundário: Chrysophyta/ultraestrutura
Microscopia Eletrônica de Transmissão
Dados de Sequência Molecular
RNA Ribossômico 18S/genética
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (RNA, Ribosomal, 18S)
[Em] Mês de entrada:1503
[Cu] Atualização por classe:161019
[Lr] Data última revisão:
161019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:141203
[St] Status:MEDLINE



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