Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.618.100 [Categoria DeCS]
Referências encontradas : 4 [refinar]
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[PMID]:29368487
[Au] Autor:Trifonova AA; Filyushin MA; Kochieva EZ; Kudryavtsev AM
[Ti] Título:[Analysis of the ITS1/ITS2 nuclear spacers and the secondary structure of 5.8S rRNA gene in endemic species Bellevalia sarmatica (Pall. ex Georgi) Woronow and related species of the subfamily scilloideae].
[So] Source:Genetika;52(5):605-10, 2016 May.
[Is] ISSN:0016-6758
[Cp] País de publicação:Russia (Federation)
[La] Idioma:rus
[Ab] Resumo:Sequence variability of the ITS spacers and 5.8S rRNA gene was examined in 11 accessions of the subfamily Scilloideae, including seven accessions of rare and endangered species Bellevalia sarmatica from Volgograd region. The intraspecific polymorphism level of the examined ITS1­5.8S­ITS2 sequence of B. sarmatica accessions constituted 1.3%. The phylogenetic position of B. sarmatica within the genus Bellevalia was determined. It was demonstrated that B. sarmatica belonged to the section Nutantes, and the most closely related species were B. webbiana and B. dubia. Nucleotide substitutions in the 5.8S rRNA gene sequence of the analyzed Scilloideae accessions were identified and studied. The predicted secondary structure of 5.8S rRNA gene was constructed. It was demonstrated that in the examined accessions, mutations in the 5.8S rRNA gene were mainly localized in the third hairpin region and had no effect on the secondary structure of the 5.8S rRNA molecule.
[Mh] Termos MeSH primário: Asparagales/genética
Variação Genética
Conformação de Ácido Nucleico
RNA Nuclear Pequeno/genética
[Mh] Termos MeSH secundário: Asparagales/química
RNA Nuclear Pequeno/química
Federação Russa
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Small Nuclear); 0 (U4 small nuclear RNA)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180205
[Lr] Data última revisão:
180205
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180126
[St] Status:MEDLINE


  2 / 4 MEDLINE  
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[PMID]:28177838
[Au] Autor:Daru BH; van der Bank M; Bello A; Yessoufou K
[Ad] Endereço:a Department of Organismic and Evolutionary Biology and Harvard University Herbaria, Harvard University, Cambridge, MA 02138, USA.
[Ti] Título:Testing the reliability of standard and complementary DNA barcodes for the monocot subfamily Alooideae from South Africa.
[So] Source:Genome;60(4):337-347, 2017 Apr.
[Is] ISSN:1480-3321
[Cp] País de publicação:Canada
[La] Idioma:eng
[Ab] Resumo:Although a standard DNA barcode has been identified for plants, it does not always provide species-level specimen identifications for investigating important ecological questions. In this study, we assessed the species-level discriminatory power of standard (rbcLa + matK) and complementary barcodes (ITS1 and trnH-psbA) within the subfamily Alooideae (Asphodelaceae), a large and recent plant radiation, whose species are important in horticulture yet are threatened. Alooideae has its centre of endemism in southern Africa, with some outlier species occurring elsewhere in Africa and Madagascar. We sampled 360 specimens representing 235 species within all 11 genera of the subfamily. With three distance-based methods, all markers performed poorly for our combined data set, with the highest proportion of correct species-level specimen identifications (30%) found for ITS1. However, when performance was assessed across genera, the discriminatory power varied from 0% for all single markers and combinations in Gasteria to 63% in Haworthiopsis, again for ITS1, suggesting that DNA barcoding success may be related to the evolutionary history of the lineage considered. Although ITS1 could be a good barcode for Haworthiopsis, the generally poor performance of all markers suggests that Alooideae remains a challenge. As species boundaries within Alooideae remain controversial, we call for continued search for suitable markers or the use of genomics approaches to further explore species discrimination in the group.
[Mh] Termos MeSH primário: Asparagales/genética
Código de Barras de DNA Taxonômico/métodos
DNA Complementar/genética
Marcadores Genéticos/genética
[Mh] Termos MeSH secundário: Asparagales/classificação
DNA de Plantas/genética
Evolução Molecular
Variação Genética
Filogenia
Reprodutibilidade dos Testes
África do Sul
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Complementary); 0 (DNA, Plant); 0 (Genetic Markers)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170406
[Lr] Data última revisão:
170406
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170209
[St] Status:MEDLINE
[do] DOI:10.1139/gen-2015-0183


  3 / 4 MEDLINE  
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[PMID]:27105886
[Au] Autor:Peña MJ; Kulkarni AR; Backe J; Boyd M; O'Neill MA; York WS
[Ad] Endereço:Complex Carbohydrate Research Center and US Department of Energy Bioenergy Science Center, University of Georgia, Athens, GA, 30602, USA.
[Ti] Título:Structural diversity of xylans in the cell walls of monocots.
[So] Source:Planta;244(3):589-606, 2016 Sep.
[Is] ISSN:1432-2048
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:MAIN CONCLUSION: Xylans in the cell walls of monocots are structurally diverse. Arabinofuranose-containing glucuronoxylans are characteristic of commelinids. However, other structural features are not correlated with the major transitions in monocot evolution. Most studies of xylan structure in monocot cell walls have emphasized members of the Poaceae (grasses). Thus, there is a paucity of information regarding xylan structure in other commelinid and in non-commelinid monocot walls. Here, we describe the major structural features of the xylans produced by plants selected from ten of the twelve monocot orders. Glucuronoxylans comparable to eudicot secondary wall glucuronoxylans are abundant in non-commelinid walls. However, the α-D-glucuronic acid/4-O-methyl-α-D-glucuronic acid is often substituted at O-2 by an α-L-arabinopyranose residue in Alismatales and Asparagales glucuronoxylans. Glucuronoarabinoxylans were the only xylans detected in the cell walls of five different members of the Poaceae family (grasses). By contrast, both glucuronoxylan and glucuronoarabinoxylan are formed by the Zingiberales and Commelinales (commelinids). At least one species of each monocot order, including the Poales, forms xylan with the reducing end sequence -4)-ß-D-Xylp-(1,3)-α-L-Rhap-(1,2)-α-D-GalpA-(1,4)-D-Xyl first identified in eudicot and gymnosperm glucuronoxylans. This sequence was not discernible in the arabinopyranose-containing glucuronoxylans of the Alismatales and Asparagales or the glucuronoarabinoxylans of the Poaceae. Rather, our data provide additional evidence that in Poaceae glucuronoarabinoxylan, the reducing end xylose residue is often substituted at O-2 with 4-O-methyl glucuronic acid or at O-3 with arabinofuranose. The variations in xylan structure and their implications for the evolution and biosynthesis of monocot cell walls are discussed.
[Mh] Termos MeSH primário: Alismatales/química
Asparagales/química
Parede Celular/química
Xilanos/química
[Mh] Termos MeSH secundário: Espectroscopia de Ressonância Magnética
Estrutura Molecular
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Xylans)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160424
[St] Status:MEDLINE
[do] DOI:10.1007/s00425-016-2527-1


  4 / 4 MEDLINE  
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[PMID]:27061096
[Au] Autor:Eguchi S; Tamura MN
[Ad] Endereço:Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan. eguchi.satoshi.32n@st.kyoto-u.ac.jp.
[Ti] Título:Evolutionary timescale of monocots determined by the fossilized birth-death model using a large number of fossil records.
[So] Source:Evolution;70(5):1136-44, 2016 May.
[Is] ISSN:1558-5646
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Although the phylogenetic relationships between monocot orders are sufficiently understood, a timescale of their evolution is needed. Several studies on molecular clock dating are available, but their results have been biased by their calibration schemes. Recently, the fossilized birth-death model, a type of Bayesian dating method, was proposed, and it does not require prior calibration and allows the use all available fossils. Using this model, we conducted divergence-time estimations of monocots to explore their evolutionary timeline without calibration bias. This is the first application of this model to seed plants. The dataset contained the matK and rbcL chloroplast genes of 118 monocot genera covering all extant orders. We employed information from 247 monocot fossils, which exceeded previous dating analyses that used a maximum of 12 monocot fossils. The crown group of monocots was dated to approximately the Late Jurassic-Early Cretaceous periods, and most extant monocot orders were estimated to diverge throughout the Early Cretaceous. Our results overlapped with the divergence time of insect lineages, such as beetles and flies, suggesting an association with pollinators in early monocot evolution. In addition, we proposed three new orders based on divergence time: Orchidales separated from Asparagales and Tofieldiales and Arales separated from Aslimatales.
[Mh] Termos MeSH primário: Asparagales/genética
Evolução Molecular
Fósseis
Orchidaceae/genética
[Mh] Termos MeSH secundário: Animais
Asparagales/classificação
Asparagales/fisiologia
Genes de Plantas
Especiação Genética
Insetos/genética
Modelos Genéticos
Orchidaceae/classificação
Orchidaceae/fisiologia
Filogenia
Polinização/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160411
[St] Status:MEDLINE
[do] DOI:10.1111/evo.12911



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