Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.100 [Categoria DeCS]
Referências encontradas : 37 [refinar]
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[PMID]:27622766
[Au] Autor:Rosato M; Kovarík A; Garilleti R; Rosselló JA
[Ad] Endereço:Jardín Botánico, ICBiBE-Unidad Asociada CSIC, Universidad de Valencia, c/Quart 80, E-46008, Valencia, Spain.
[Ti] Título:Conserved Organisation of 45S rDNA Sites and rDNA Gene Copy Number among Major Clades of Early Land Plants.
[So] Source:PLoS One;11(9):e0162544, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Genes encoding ribosomal RNA (rDNA) are universal key constituents of eukaryotic genomes, and the nuclear genome harbours hundreds to several thousand copies of each species. Knowledge about the number of rDNA loci and gene copy number provides information for comparative studies of organismal and molecular evolution at various phylogenetic levels. With the exception of seed plants, the range of 45S rDNA locus (encoding 18S, 5.8S and 26S rRNA) and gene copy number variation within key evolutionary plant groups is largely unknown. This is especially true for the three earliest land plant lineages Marchantiophyta (liverworts), Bryophyta (mosses), and Anthocerotophyta (hornworts). In this work, we report the extent of rDNA variation in early land plants, assessing the number of 45S rDNA loci and gene copy number in 106 species and 25 species, respectively, of mosses, liverworts and hornworts. Unexpectedly, the results show a narrow range of ribosomal locus variation (one or two 45S rDNA loci) and gene copies not present in vascular plant lineages, where a wide spectrum is recorded. Mutation analysis of whole genomic reads showed higher (3-fold) intragenomic heterogeneity of Marchantia polymorpha (Marchantiophyta) rDNA compared to Physcomitrella patens (Bryophyta) and two angiosperms (Arabidopsis thaliana and Nicotiana tomentosifomis) suggesting the presence of rDNA pseudogenes in its genome. No association between phylogenetic position, taxonomic adscription and the number of rDNA loci and gene copy number was found. Our results suggest a likely evolutionary rDNA stasis during land colonisation and diversification across 480 myr of bryophyte evolution. We hypothesise that strong selection forces may be acting against ribosomal gene locus amplification. Despite showing a predominant haploid phase and infrequent meiosis, overall rDNA homogeneity is not severely compromised in bryophytes.
[Mh] Termos MeSH primário: DNA de Plantas/genética
Embriófitas/classificação
Embriófitas/genética
[Mh] Termos MeSH secundário: Anthocerotophyta/classificação
Anthocerotophyta/genética
Arabidopsis/classificação
Arabidopsis/genética
Briófitas/classificação
Briófitas/genética
Cromossomos de Plantas/genética
Sequência Conservada
Análise Citogenética
DNA Ribossômico/genética
Evolução Molecular
Dosagem de Genes
Genes de Plantas
Hepatófitas/classificação
Hepatófitas/genética
Hibridização in Situ Fluorescente
Filogenia
RNA de Plantas/genética
RNA Ribossômico/genética
Reação em Cadeia da Polimerase em Tempo Real
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Plant); 0 (DNA, Ribosomal); 0 (RNA, Plant); 0 (RNA, Ribosomal); 0 (RNA, ribosomal, 45S)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170808
[Lr] Data última revisão:
170808
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160914
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0162544


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[PMID]:26555468
[Au] Autor:Chasov AV; Beckett RP; Minibayeva FV
[Ad] Endereço:Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center, Russian Academy of Sciences, Kazan, 420111, Russia. chasov@kibb.knc.ru.
[Ti] Título:Activity of Redox Enzymes in the Thallus of Anthoceros natalensis.
[So] Source:Biochemistry (Mosc);80(9):1157-68, 2015 Sep.
[Is] ISSN:1608-3040
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Anthocerotophyta (hornworts) belong to a group of ancient nonvascular plants and originate from a common ancestor with contemporary vascular plants. Hornworts represent a unique model for investigating mechanisms of formation of stress resistance in higher plants due to their high tolerance to the action of adverse environmental factors. In this work, we demonstrate that the thallus of Anthoceros natalensis exhibits high redox activity changing under stress. Dehydration of the thallus is accompanied by the decrease in activities of intracellular peroxidases, DOPA-peroxidases, and tyrosinases, while catalase activity increases. Subsequent rehydration results in the increase in peroxidase and catalase activities. Kinetic features of peroxidases and tyrosinases were characterized as well as the peroxidase isoenzyme composition of different fractions of the hornwort cell wall proteins. It was shown that the hornwort peroxidases are functionally similar to peroxidases of higher vascular plants including their ability to form superoxide anion-radical. The biochemical mechanism was elucidated, supporting the possible participation of peroxidases in the formation of reactive oxygen species (ROS) via substrate-substrate interactions in the hornwort thallus. It has been suggested that the ROS formation by peroxidases is an evolutionarily ancient process that emerged as a protective mechanism for enhancing adaptive responses of higher land plants and their adaptation to changing environmental conditions and successful colonization of various ecological niches.
[Mh] Termos MeSH primário: Anthocerotophyta/enzimologia
Catalase/fisiologia
Monofenol Mono-Oxigenase/fisiologia
Oxirredução
Peroxidase/fisiologia
[Mh] Termos MeSH secundário: Anthocerotophyta/fisiologia
Espécies Reativas de Oxigênio/metabolismo
Estresse Fisiológico
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Reactive Oxygen Species); EC 1.11.1.6 (Catalase); EC 1.11.1.7 (Peroxidase); EC 1.14.18.1 (Monophenol Monooxygenase)
[Em] Mês de entrada:1608
[Cu] Atualização por classe:151111
[Lr] Data última revisão:
151111
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151112
[St] Status:MEDLINE
[do] DOI:10.1134/S0006297915090060


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[PMID]:26300117
[Au] Autor:Chen M; Zhang LL; Li J; He XJ; Cai JC
[Ad] Endereço:Institute of Ecology and Environment, State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China. Electronic address: chenm1004@gmail.com.
[Ti] Título:Bioaccumulation and tolerance characteristics of a submerged plant (Ceratophyllum demersum L.) exposed to toxic metal lead.
[So] Source:Ecotoxicol Environ Saf;122:313-21, 2015 Dec.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A hydroponic study was conducted to investigate the lead bioaccumulation and tolerance characteristics of Ceratophyllum demersum L. exposed to various lead concentrations (5-80 µM) for 7, 14 or 21 days. Lead accumulation increased with increasing concentrations of metal in the solution, to a maximum accumulation of 4016.4 mg kg(-1) dw. Unexpectedly, the release of accumulated lead from the plants into solution was observed for all experimental groups except those exposed to 5 µM. Both the biomass and protein content of the plants responded significantly to lead stress. Malondialdehyde (MDA) levels increased substantially at lead concentrations below 20 µM, further indicating that this metal is toxic to the plants. To reveal the mechanism underlying the defense against lead stress, plants were also assayed for the activities of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD), as well as other relevant enzymes such as phenylalanine ammonia-lyase (PAL) and polyphenol oxidase (PPO). The activities of both SOD and CAT increased at lower lead concentrations and with shorter exposure times, followed by a decline, but the activities of POD and its isoenzymes continued to increase under all conditions. Moreover, increases in the activities of PAL and PPO were observed only for the 14-day treatment, and these two enzymes were not sensitive to lead concentration. These results suggest that C. demersum exhibits strong tolerance within a specific concentration range of lead in solution; according to regression analysis, 40 µM is suggested to be this plant's tolerance threshold for lead in water. Furthermore, the malfunction of this tolerance mechanism might accelerate the metal-release process. These attributes are likely to be beneficial for utilizing C. demersum in phytoremediation applications.
[Mh] Termos MeSH primário: Anthocerotophyta/crescimento & desenvolvimento
Antioxidantes/metabolismo
Chumbo/análise
Estresse Oxidativo/efeitos dos fármacos
Poluentes do Solo/análise
[Mh] Termos MeSH secundário: Anthocerotophyta/efeitos dos fármacos
Anthocerotophyta/enzimologia
Biodegradação Ambiental
Biomassa
Catalase/metabolismo
Chumbo/metabolismo
Chumbo/toxicidade
Malondialdeído/metabolismo
Modelos Teóricos
Peroxidases/metabolismo
Fenilalanina Amônia-Liase/metabolismo
Proteínas de Plantas/metabolismo
Poluentes do Solo/metabolismo
Poluentes do Solo/toxicidade
Soluções
Superóxido Dismutase/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Antioxidants); 0 (Plant Proteins); 0 (Soil Pollutants); 0 (Solutions); 2P299V784P (Lead); 4Y8F71G49Q (Malondialdehyde); EC 1.11.1.- (Peroxidases); EC 1.11.1.6 (Catalase); EC 1.15.1.1 (Superoxide Dismutase); EC 4.3.1.24 (Phenylalanine Ammonia-Lyase)
[Em] Mês de entrada:1606
[Cu] Atualização por classe:151021
[Lr] Data última revisão:
151021
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150825
[St] Status:MEDLINE


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[PMID]:26215968
[Au] Autor:Li FW; Melkonian M; Rothfels CJ; Villarreal JC; Stevenson DW; Graham SW; Wong GK; Pryer KM; Mathews S
[Ad] Endereço:Department of Biology, Duke University, Durham, North Carolina 27708, USA.
[Ti] Título:Phytochrome diversity in green plants and the origin of canonical plant phytochromes.
[So] Source:Nat Commun;6:7852, 2015 Jul 28.
[Is] ISSN:2041-1723
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Phytochromes are red/far-red photoreceptors that play essential roles in diverse plant morphogenetic and physiological responses to light. Despite their functional significance, phytochrome diversity and evolution across photosynthetic eukaryotes remain poorly understood. Using newly available transcriptomic and genomic data we show that canonical plant phytochromes originated in a common ancestor of streptophytes (charophyte algae and land plants). Phytochromes in charophyte algae are structurally diverse, including canonical and non-canonical forms, whereas in land plants, phytochrome structure is highly conserved. Liverworts, hornworts and Selaginella apparently possess a single phytochrome, whereas independent gene duplications occurred within mosses, lycopods, ferns and seed plants, leading to diverse phytochrome families in these clades. Surprisingly, the phytochrome portions of algal and land plant neochromes, a chimera of phytochrome and phototropin, appear to share a common origin. Our results reveal novel phytochrome clades and establish the basis for understanding phytochrome functional evolution in land plants and their algal relatives.
[Mh] Termos MeSH primário: Carofíceas/genética
Variação Genética
Fitocromo/genética
Viridiplantae/genética
[Mh] Termos MeSH secundário: Anthocerotophyta/genética
Sequência de Bases
Briófitas/genética
Evolução Molecular
Gleiquênias/genética
Hepatófitas/genética
Lycopodium/genética
Dados de Sequência Molecular
Selaginellaceae/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
11121-56-5 (Phytochrome)
[Em] Mês de entrada:1604
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150729
[St] Status:MEDLINE
[do] DOI:10.1038/ncomms8852


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[PMID]:26110834
[Au] Autor:Kuda T; Nemoto M; Kawahara M; Oshio S; Takahashi H; Kimura B
[Ad] Endereço:Department of Food Science and Technology, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-city, Tokyo 108-8477, Japan. kuda@kaiyodai.ac.jp.
[Ti] Título:Induction of the superoxide anion radical scavenging capacity of dried 'funori'Gloiopeltis furcata by Lactobacillus plantarum S-SU1 fermentation.
[So] Source:Food Funct;6(8):2535-41, 2015 Aug.
[Is] ISSN:2042-650X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:To understand the beneficial properties of edible algae obtained from the north-eastern (Sanriku) Satoumi region of Japan, the antioxidant properties of hot aqueous extract solutions (AES) obtained from 18 dried algal products were determined. The samples included 4 Ceratophyllum demersum (matsumo), 5 Undaria pinnatifida (wakame), 5 Laminaria japonica (kombu), and 2 each of Gloiopeltis furcate (funori) and G. tenax (funori). Of these products, the total phenolic content and Fe-reducing power were highest in matsumo. On the other hand, the polysaccharide content, viscosity, and superoxide anion radical (O2Ë™(-))-scavenging capacity were highest in funori. Lactobacillus plantarum S-SU3, isolated from the intestine of Japanese surfperch, and Lb. plantarum S-SU1, isolated from salted squid, could ferment the AES of matsumo and funori, respectively. Although the Fe-reducing power of the matsumo solution was reduced due to fermentation, the O2Ë™(-)-scavenging capacity of the funori solution was increased by fermentation. Furthermore, the fermented funori suspension protected Saccharomyces cerevisiae, a live cell model, against H2O2 toxicity. These results suggest that the fermented funori is a promising functional food material that is capable of protecting against reactive oxygen species.
[Mh] Termos MeSH primário: Anthocerotophyta/microbiologia
Depuradores de Radicais Livres/metabolismo
Lactobacillus plantarum/metabolismo
Feófitas/microbiologia
Extratos Vegetais/metabolismo
Rodófitas/microbiologia
Superóxidos/metabolismo
[Mh] Termos MeSH secundário: Anthocerotophyta/metabolismo
Fermentação
Depuradores de Radicais Livres/análise
Depuradores de Radicais Livres/farmacologia
Peróxido de Hidrogênio/toxicidade
Feófitas/metabolismo
Extratos Vegetais/análise
Extratos Vegetais/farmacologia
Rodófitas/metabolismo
Saccharomyces cerevisiae/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Free Radical Scavengers); 0 (Plant Extracts); 11062-77-4 (Superoxides); BBX060AN9V (Hydrogen Peroxide)
[Em] Mês de entrada:1602
[Cu] Atualização por classe:150806
[Lr] Data última revisão:
150806
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150626
[St] Status:MEDLINE
[do] DOI:10.1039/c5fo00668f


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[PMID]:25886741
[Au] Autor:Szövényi P; Frangedakis E; Ricca M; Quandt D; Wicke S; Langdale JA
[Ad] Endereço:Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland. peter.szoevenyi@uzh.ch.
[Ti] Título:Establishment of Anthoceros agrestis as a model species for studying the biology of hornworts.
[So] Source:BMC Plant Biol;15:98, 2015 Apr 09.
[Is] ISSN:1471-2229
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Plants colonized terrestrial environments approximately 480 million years ago and have contributed significantly to the diversification of life on Earth. Phylogenetic analyses position a subset of charophyte algae as the sister group to land plants, and distinguish two land plant groups that diverged around 450 million years ago - the bryophytes and the vascular plants. Relationships between liverworts, mosses hornworts and vascular plants have proven difficult to resolve, and as such it is not clear which bryophyte lineage is the sister group to all other land plants and which is the sister to vascular plants. The lack of comparative molecular studies in representatives of all three lineages exacerbates this uncertainty. Such comparisons can be made between mosses and liverworts because representative model organisms are well established in these two bryophyte lineages. To date, however, a model hornwort species has not been available. RESULTS: Here we report the establishment of Anthoceros agrestis as a model hornwort species for laboratory experiments. Axenic culture conditions for maintenance and vegetative propagation have been determined, and treatments for the induction of sexual reproduction and sporophyte development have been established. In addition, protocols have been developed for the extraction of DNA and RNA that is of a quality suitable for molecular analyses. Analysis of haploid-derived genome sequence data of two A. agrestis isolates revealed single nucleotide polymorphisms at multiple loci, and thus these two strains are suitable starting material for classical genetic and mapping experiments. CONCLUSIONS: Methods and resources have been developed to enable A. agrestis to be used as a model species for developmental, molecular, genomic, and genetic studies. This advance provides an unprecedented opportunity to investigate the biology of hornworts.
[Mh] Termos MeSH primário: Anthocerotophyta/crescimento & desenvolvimento
Anthocerotophyta/genética
Cultura Axênica/métodos
[Mh] Termos MeSH secundário: Dados de Sequência Molecular
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1605
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150419
[St] Status:MEDLINE
[do] DOI:10.1186/s12870-015-0481-x


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[PMID]:24912247
[Au] Autor:Borisova G; Chukina N; Maleva M; Prasad MN
[Ti] Título:Ceratophyllum demersum L. and Potamogeton alpinus Balb. from Iset' river, Ural region, Russia differ in adaptive strategies to heavy metals exposure--a comparative study.
[So] Source:Int J Phytoremediation;16(6):621-33, 2014.
[Is] ISSN:1522-6514
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We examined the uptake of five heavy metals (Cu, Fe, Ni, Zn, and Mn) in Ceratophyllum demersum L. (hornwort) and Potamogeton alpinus Balb. (pondweed) from Iset' river, Ural region, Russia. This study was conducted in a territory that is highly urbanized where the surface waters are contaminated by a wide spectrum of pollutants. The environmental situation in this territory drastically deteriorated due to anthropogenic activity. The water quality in most of the water bodies in the Ural region is rather poor. In a comparative study of C. demersum and P. alpinus, differential accumulation pattern was noted for heavy metals (HMs). Higher amounts of HMs accumulated in C. demersum compared to P. alpinus. Also it was shown that in leaves of C. demersum there were high amount of total phosphorus, nitrogen, organics acids and ash; high activity of guaiacol peroxidase; high content of nonenzymatic antioxidants viz., flavonoids, ascorbate, glutathione and proline; high amount of thiols (soluble and membrane bound) compared to P. alpinus.
[Mh] Termos MeSH primário: Anthocerotophyta/fisiologia
Metais Pesados/metabolismo
Potamogetonaceae/fisiologia
Poluentes Químicos da Água/metabolismo
[Mh] Termos MeSH secundário: Adaptação Fisiológica
Antioxidantes/análise
Antioxidantes/metabolismo
Biodegradação Ambiental
Ácidos Carboxílicos/análise
Ácidos Carboxílicos/metabolismo
Monitoramento Ambiental
Sedimentos Geológicos
Metais Pesados/análise
Nitrogênio/análise
Nitrogênio/metabolismo
Fósforo/análise
Fósforo/metabolismo
Folhas de Planta
Rios
Federação Russa
Poluentes Químicos da Água/análise
Qualidade da Água
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Antioxidants); 0 (Carboxylic Acids); 0 (Metals, Heavy); 0 (Water Pollutants, Chemical); 27YLU75U4W (Phosphorus); N762921K75 (Nitrogen)
[Em] Mês de entrada:1407
[Cu] Atualização por classe:140610
[Lr] Data última revisão:
140610
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140611
[St] Status:MEDLINE


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[PMID]:24792087
[Au] Autor:Villarreal JC; Renner SS
[Ad] Endereço:Systematic Botany and Mycology, University of Munich (LMU), Germany. Electronic address: jcarlos.villarreal@gmail.com.
[Ti] Título:A review of molecular-clock calibrations and substitution rates in liverworts, mosses, and hornworts, and a timeframe for a taxonomically cleaned-up genus Nothoceros.
[So] Source:Mol Phylogenet Evol;78:25-35, 2014 Sep.
[Is] ISSN:1095-9513
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Absolute times from calibrated DNA phylogenies can be used to infer lineage diversification, the origin of new ecological niches, or the role of long distance dispersal in shaping current distribution patterns. Molecular-clock dating of non-vascular plants, however, has lagged behind flowering plant and animal dating. Here, we review dating studies that have focused on bryophytes with several goals in mind, (i) to facilitate cross-validation by comparing rates and times obtained so far; (ii) to summarize rates that have yielded plausible results and that could be used in future studies; and (iii) to calibrate a species-level phylogeny for Nothoceros, a model for plastid genome evolution in hornworts. Including the present work, there have been 18 molecular clock studies of liverworts, mosses, or hornworts, the majority with fossil calibrations, a few with geological calibrations or dated with previously published plastid substitution rates. Over half the studies cross-validated inferred divergence times by using alternative calibration approaches. Plastid substitution rates inferred for "bryophytes" are in line with those found in angiosperm studies, implying that bryophyte clock models can be calibrated either with published substitution rates or with fossils, with the two approaches testing and cross-validating each other. Our phylogeny of Nothoceros is based on 44 accessions representing all suspected species and a matrix of six markers of nuclear, plastid, and mitochondrial DNA. The results show that Nothoceros comprises 10 species, nine in the Americas and one in New Zealand (N. giganteus), with the divergence between the New Zealand species and its Chilean sister species dated to the Miocene and therefore due to long-distance dispersal. Based on the new tree, we formally transfer two species of Megaceros into Nothoceros, resulting in the new combinations N. minarum (Nees) J.C. Villarreal and N. schizophyllus (Gottsche ex Steph.) J.C. Villarreal, and we also newly synonymize eight names described in Megaceros.
[Mh] Termos MeSH primário: Anthocerotophyta/classificação
Briófitas/classificação
Hepatófitas/classificação
Filogenia
[Mh] Termos MeSH secundário: Anthocerotophyta/genética
Briófitas/genética
Calibragem
Fósseis
Hepatófitas/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1501
[Cu] Atualização por classe:140922
[Lr] Data última revisão:
140922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140506
[St] Status:MEDLINE


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[PMID]:24733898
[Au] Autor:Li FW; Villarreal JC; Kelly S; Rothfels CJ; Melkonian M; Frangedakis E; Ruhsam M; Sigel EM; Der JP; Pittermann J; Burge DO; Pokorny L; Larsson A; Chen T; Weststrand S; Thomas P; Carpenter E; Zhang Y; Tian Z; Chen L; Yan Z; Zhu Y; Sun X; Wang J; Stevenson DW; Crandall-Stotler BJ; Shaw AJ; Deyholos MK; Soltis DE; Graham SW; Windham MD; Langdale JA; Wong GK; Mathews S; Pryer KM
[Ad] Endereço:Department of Biology, Duke University, Durham, NC 27708.
[Ti] Título:Horizontal transfer of an adaptive chimeric photoreceptor from bryophytes to ferns.
[So] Source:Proc Natl Acad Sci U S A;111(18):6672-7, 2014 May 06.
[Is] ISSN:1091-6490
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Ferns are well known for their shade-dwelling habits. Their ability to thrive under low-light conditions has been linked to the evolution of a novel chimeric photoreceptor--neochrome--that fuses red-sensing phytochrome and blue-sensing phototropin modules into a single gene, thereby optimizing phototropic responses. Despite being implicated in facilitating the diversification of modern ferns, the origin of neochrome has remained a mystery. We present evidence for neochrome in hornworts (a bryophyte lineage) and demonstrate that ferns acquired neochrome from hornworts via horizontal gene transfer (HGT). Fern neochromes are nested within hornwort neochromes in our large-scale phylogenetic reconstructions of phototropin and phytochrome gene families. Divergence date estimates further support the HGT hypothesis, with fern and hornwort neochromes diverging 179 Mya, long after the split between the two plant lineages (at least 400 Mya). By analyzing the draft genome of the hornwort Anthoceros punctatus, we also discovered a previously unidentified phototropin gene that likely represents the ancestral lineage of the neochrome phototropin module. Thus, a neochrome originating in hornworts was transferred horizontally to ferns, where it may have played a significant role in the diversification of modern ferns.
[Mh] Termos MeSH primário: Briófitas/genética
Gleiquênias/genética
Transferência Genética Horizontal
Fotorreceptores de Plantas/genética
[Mh] Termos MeSH secundário: Proteínas de Algas/genética
Anthocerotophyta/genética
Sequência de Bases
DNA de Plantas/genética
Evolução Molecular
Genes de Plantas
Dados de Sequência Molecular
Fototropinas/genética
Filogenia
Fitocromo/genética
Proteínas Recombinantes de Fusão/genética
Transcriptoma
Xantofilas/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (Algal Proteins); 0 (DNA, Plant); 0 (Photoreceptors, Plant); 0 (Phototropins); 0 (Recombinant Fusion Proteins); 0 (Xanthophylls); 0 (neochrome); 11121-56-5 (Phytochrome)
[Em] Mês de entrada:1407
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140416
[St] Status:MEDLINE
[do] DOI:10.1073/pnas.1319929111


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[PMID]:24180692
[Au] Autor:Villarreal JC; Renner SS
[Ad] Endereço:Systematic Botany and Mycology, Department of Biology, University of Munich (LMU), Munich, Germany. jcarlos.villarreal@gmail.com.
[Ti] Título:Correlates of monoicy and dioicy in hornworts, the apparent sister group to vascular plants.
[So] Source:BMC Evol Biol;13:239, 2013 Nov 02.
[Is] ISSN:1471-2148
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Whether male and female gametes are produced by single or separate individuals shapes plant mating and hence patterns of genetic diversity among and within populations. Haploid-dominant plants ("bryophytes": liverworts, mosses and hornworts) can have unisexual (dioicous) or bisexual (monoicous) gametophytes, and today, 68% of liverwort species, 57% of moss species, and 40% of hornwort species are dioicous. The transitions between the two sexual systems and possible correlations with other traits have been studied in liverworts and mosses, but not hornworts. Here we use a phylogeny for 98 of the 200 species of hornworts, the sister group to vascular plants, representing roughly equal proportions of all monoicous and all dioicous species, to test whether transitions in sexual systems are predominantly from monoicy to dioicy as might be expected based on studies of mosses. We further investigate possible correlations between sexual system and spore size, antheridium number, ploidy level, and diversification rate, with character selection partly based on findings in mosses and liverworts. RESULTS: Hornworts underwent numerous transitions between monoicy and dioicy. The transition rate from dioicy to monoicy was 2× higher than in the opposite direction, but monoicous groups have higher extinction rates; diversification rates do not correlate with sexual system. A correlation important in mosses, that between monoicy and polyploidy, apparently plays a small role: of 20 species with chromosome counts, only one is polyploid, the monoicous Anthoceros punctatus. A contingency test revealed that transitions to dioicy were more likely in species with small spores, supporting the hypothesis that small but numerous spores may be advantageous for dioicous species that depend on dense carpets of gametophytes for reproductive assurance. However, we found no evidence for increased antheridium-per-chamber numbers in dioicous species. CONCLUSIONS: Sexual systems in hornworts are labile, and the higher number of extant monoicous species (60%) may be largely due to frequent transitions to monoicy.
[Mh] Termos MeSH primário: Anthocerotophyta/fisiologia
[Mh] Termos MeSH secundário: Anthocerotophyta/classificação
Anthocerotophyta/genética
Variação Genética
Filogenia
Plantas/classificação
Plantas/genética
Reprodução
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1403
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:131105
[St] Status:MEDLINE
[do] DOI:10.1186/1471-2148-13-239



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